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

A．what it is thatB．what is it thatC．how is it thatD．how it is that

D

解析試題分析：句意：困擾他們的問(wèn)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(yǔ)從句，表語(yǔ)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(yǔ)從句的用法。

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