The question that puzzles them is ___they can finish the work on timeA.what it is thatB.what is it thatC.how is it thatD.how it is that
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D解析试题分析：句意：困扰他们的问题是他们究竟怎样才能按时完成工作。此处is之后是表语从句，表语从句由强调句型构成，相当于：it is how that they can finish the work on time.这里how是连词置于句首。故选D。考点：考查强调句型及宾语从句的用法。