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【单选题】

A series of attempts ______made, he came to a successful solution of the problem.
A.to be

B.had been
C.were
D.having been
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根据网考网移动考试中心的统计,该试题:

5%的考友选择了A选项

41%的考友选择了B选项

2%的考友选择了C选项

52%的考友选择了D选项

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