专四专八考试

根据网考网考试中心的统计分析，以下试题在2015-12-22日专四专八考试专四考试习题练习中，答错率较高，为：98%
【单选题】I am sure Mary has been here and . （） 
A. did what required her
B. has done what required her
C. has done what was，required of her
D. did what has been required of her

参考答案：C，答错率：98%
试题解析：
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