2. 考研
  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 “make attempts to”即“尝试着做某事”。根据后半句的时态可知前半句的时态应当是现在完成时，其中A series of attempts充当逻辑主语，需采用被动语态。所以正确答案为D。
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