The question that puzzles them is ___they can finish the work on time.

A. what it is that    B. what is it that   C. how is it that     D. how it is that  

 

【答案】

D

【解析】

試題分析：句意：困擾他們的問題是他們究竟怎樣才能按時(shí)完成工作。此處is之后是表語從句，表語從句由強(qiáng)調(diào)句型構(gòu)成，相當(dāng)于：it is how that they can finish the work on time.這里how是連詞置于句首。故選D。

考點(diǎn)：考查強(qiáng)調(diào)句型及賓語從句的用法。

 

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