大家帮我看看几道英语题
Medical researchers are painfully aware that there are many problems _____(他们至今都没有找到答案)
一定是which thay haven't found answers to
能不能是and they haven't found answers yet.
这句的意思是这些 many problems 是他们至今都没有找到答案的 problems，所以说"他们至今都没有找到答案"是用来修饰 problems的, 那就要用定语从句修饰problems了，所以一定要用which thay haven't found answers to。and是并列结构，起不到修饰作用。
_______ (大多数父母所关心的) is providing the best education for their children
What most parents care about
没有about行不行？
可以，care本身就是及物动词，后面能直接跟宾语。
Throught the project ,many people have received training and ___(决定自己创业)
decided to start their own business.
为什么不是they decided to start their own business.???and之后不就是另一句话了吗？
and 是并列结构，前后不一定都是句子做并列成分的，比如 I have an apple and a pear.前后都是名词结构。 I have read the book and finished my homework. 同样都不是完整的句子结构来做并列成分的。
The anti-virus agent was not known _____(直到一名医生偶然发现了它)
until it was accidentally found by a doctor
能不能是a doctor find it accidentally.
可以，但是find要改为 found，过去式。
until 作为连词，其后所跟的是一句完整的句子，其被动主动都不会被其前后句子所限制。
until 此外也能做介词，后跟名词作宾语。
希望能帮到你。
没问题呀,几句话都是对的!加油加油!
1.Ten days 表示的是一段时间,时间是不可数名词,所以系动词用is,这跟days无关2．根据句意－－在理解句子的意思上你有什么困难吗？ 来判断，困难是名词，所以要用 difficult 的名词形式
difficulty
3．do something 表示做某事，现在题目要考的是它的否定形式，所以应是didn't do anything ,答案很明显的
4．这是个复合句，要慢慢分析，正确理解句意才行．在这里，that指代the only thing ,引导后面的定语从句
5．这题我无能为力了．对不起了．知道答案的时候告诉我声，谢了！
难做得很Ten days单数
difficulty in词组
only 不是要跟that的嘛,限定词要加的
3我怎么觉得的not do
5倒装句理不清楚...
1.十天对Mr.Carter来说足够去完成他的设计了，他不需要更多了。
dosn't说明是一般现在时
2.have difficulty in doing sth做某事有困难 固定短语
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