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___ is the most useful invention?

A.Do you think which of these

B.Which of these you know

C.Which of these do you know

D.You know which of these

 

【答案】

C

【解析】考察句型,do you know是插入语,与句子结构无关,放在句中。

句意为,你知道这些发明里面哪个是最有用的发明?

 

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