Do you know the diffculty he had ____the work.

来源：百度知道编辑：UC知道时间：2024/05/06 02:03:15

A.on finishing B.to finish
c.finishing D.have finished

C.
句子中的he had 做定语修饰diffculty（定语从句）
把he had 去掉，再看看这个句子：
Do you know the diffculty ____the work。
在这，考察diffculty的一个用法：diffculty （in) doing sth.其中的in可以省略。所以选择C

c
省略in

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