改错. He mustn't be at home. I saw him here just now.
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A 否定性推测一定要用can’t。
选c
首先句子的动词时be，不能用must
so he is是对上文的肯定，意思是”确实这样“（从头到尾都是他一个人）
so is he的意思是”他也是这样“，也就是如果前文说了别人的一种情况，然后用so is he， 意思是他和前文所说的那人情况一样。（这里有两个人了）
mustn't改为can't这属于情态动词用法,表示肯定不用的是can't.mustn't是禁止的意思.
mustn't 是禁止的意思
如果要想表达 他一定不在家 可以用
He could not be at home.
老腾素安： mustn't改为can't这属于情态动词用法,表示肯定不用的是can't.mustn't是禁止的意思.
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