My sister met him at the Grand theatre yesterday afternoon,so he_______have attended your lecture.

My sister met him at Ningbo Grand Theatre yesterday afternoon, so he &...~

D 从上文可知，句子叙述的是已经发生过的事情，故用完成时态，mustn’t have done表示禁止的意思，故选D，以此他不可能参加过你的演讲。

A 考察情态动词，couldn’t have attended不可能做了某事 needn’t have attended本不需要干某事mustn’t have attended禁止干某事 shouldn’t have attended本不应当干某事句意为，我的姐姐昨天下午在大剧院遇到了他，因此他不可能参加了你的讲座

My sister met him at the Grand theatre yesterday afternoon,so he_______have attended your lecture
昨天下午我妹妹在大剧院碰见了他，因此他【肯定没有】参加你的讲座。

A couldn't 没有
B needn't 不需要
C mustn't 不准 禁止
D Shouldn't 不应该

这里根据句意可知，是(推测过去不可能发生的事情，用Couldn't have done)，请记住！选A

下面补充一点供你参考，和答题无关（这题标准答案肯定是A）：
但是，也有人提出了该题已不符合现代英语，尤其是美国英语的实际使用情况，应当改进。目前有充分的资料证明mustn't have done也可以用来表示“推测过去不可能发生某事”。例如：
1．His absence mustn't have been noticed．（CGEL）他的缺席一定没有人注意到。
2．Mr．Green mustn'thave received my letter，otherwise he would have replied before now．格林先生一定没有收到我的信，要不然他在这之前早就回信了。

【英语牛人团】牛人倾情奉献，您的满意使我们最大的追求，感谢您的采纳！

你好。答案是A
he COULDN'T have attended your lecture.
== It is impossible that he attended your lecture.

A
can't/ couldn't have done 根本不可能...
needn't have done 本没必要,,,,
must have done. 肯定已经.....(不要用mustn't have done.....)
shouldn't have done 本不该......

A,应该是他不可能会参加你的演讲，据前半句判断

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永新区15731811632： My sister met him at the Grand Theater yesterday afternoon, so he - ----- - your lecture. - ？
策肺瑞他： 答案A 考察情态动词,couldn't have attended不可能做了某事 needn't have attended本不需要干某事 mustn't have attended禁止干某事 shouldn't have attended本不应当干某事 句意为,我的姐姐昨天下午在大剧院遇到了他,因此他不可能参加了你的讲座

永新区15731811632： My sister met him at the Grand theatre yesterday afternoon,so he - ------have attended your lecture. - ？
策肺瑞他： My sister met him at the Grand theatre yesterday afternoon,so he_______have attended your lecture 昨天下午我妹妹在大剧院碰见了他,因此他【肯定没有】参加你的讲座.A couldn't 没有 B needn't 不需要 C mustn't 不准 禁止 D Shouldn't 不应...

永新区15731811632： My sister met him at the Grand Theatre yesterday afternoon, so he - ------ - your lecture.？
策肺瑞他： 答案Acouldn't have done表达的是过去不可能做过某事,是一种否定推测.

永新区15731811632： My sister met him at the Grand Theater yeasterday afertnoon,sohe - yourleature？
策肺瑞他： 1 A 表示过去不可能发生的情况 2 A separate...from是常用结构:把……和……分开/隔开 separate room这里的separate是形容词作定语:单独的,分开的

永新区15731811632： 英语作文婚礼 - ？
策肺瑞他： My Cousin's WeddingLast week, I attended my cousin's wedding with my mother. Our relationship is very close. She always looked after me, treated me well when I was a wimpykid. So, seeing she got married, I was very happy for her. When ...

永新区15731811632： my sister met him at theGrand Theater yeasterday afertnoon,sohe - yourleature - ？
策肺瑞他： 首先,attend a lecture,所以C就不对.could 是可能,couldn't have attended 不可能参加了 should 是应该,shouldn't have attended 不应该参加了 整句的翻译是:我妹妹昨天下午在 Grand Theater 碰到他了,所以他不可能现场聆听您的演讲.有问题,再问

永新区15731811632： my sister and me / my sister and i 有什么区别 - ？
策肺瑞他： 1. A 宾格 作help 动词的对象me2. B主格I 作主语3.A so +助动词do/does/did/be 动词/情态动词 表:...也一样!!

永新区15731811632： my sister is as tall as I还是me? - ？
策肺瑞他： 都是对的.严格来讲,比较的是My sister 和 I ,强调比较的对等性.所以书面语中用I才对 但是真正的英语口语中往往只用me来代替.

永新区15731811632： 是my sister and me还是ma sister and I? - ？
策肺瑞他： my sister and I

永新区15731811632： 四年级英语作文:my sister不少于30词 - ？
策肺瑞他： I have a sister. Her name is XXX.She is XX years old. She is friendly. She is a student in the XX school.She likes drawing because she thinks it can make her relax. In addition, although she sings not well, she likes singing. I love my sister.