2. 外语
  3. A series of attempts______made, he came to a successful solution of the problem.

A series of attempts______made, he came to a successful solution of the problem.

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问题 A series of attempts______made, he came to a successful solution of the problem.
选项 A、to be
B、had been
C、were
D、having been
答案D
解析 这是一道语法题。考点是动词过去完成时被动语态的用法。
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成人本科学位英语

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