A series of attempts ______ , we came to a wonderful solution to the problem.A、h

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问题 A series of attempts ______ , we came to a wonderful solution to the problem.

选项 A、had been made
B、were made
C、having made
D、having been made

答案 D

解析句中现在分词短语作状语，表示动作已经发生，因此用完成形式。例如：Having finished her work，she went home．她干完工作就回家了。题目中句子用的是现在分词的被动形式。

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