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  3. A series of attempts ________, we came to a wonderful solution to the problem.

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。题目中句子用的是现在分词的被动形式。
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