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

試題分析：句意：困擾他們的問題是他們究竟怎樣才能按時完成工作。此處is之后是表語從句，表語從句由強調(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。
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