一道英语单选.________hard before,Tom is afraid of failing in the e

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一道英语单选
.________hard before,Tom is afraid of failing in the exam.
A.Having been worked B.Not to have worked
C.Having never worked D.Never have worked
为什么选A 为什么用been?Tom与work不是主谓关系么?不应该用having worked hard before

答案错了
选 C 额---
been是表示‘一直’或者‘从来’的话
应该用 Having been working

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