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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.
游客
2025-03-07
26
管理
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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