A series of attempts______, we came to a wonderful solution to the problem.

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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 句意:经过一番努力,我们最终找到了解决这一问题的好方法。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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