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 Theexperimenthasbeenfinished,butnooneknowswhatgreatdif...

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问题详情:

 Theexperimenthasbeenfinished,butnooneknowswhatgreatdif...

 The experiment has been finished, but no one knows what great difficulty I had __ it.

  A. making          B. made          C. to make          D. for making

【回答】

A

知识点:非谓语动词

题型:选择题

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