I for three hours when I suddenly became sick. A. had been working B. would work C. have worked D. am working 题目和参考答案——青夏教育精英家教网——

题目内容

I ______ for three hours when I suddenly became sick.

A. had been working B. would work

C. have worked D. am working

A

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　 A. had been working　 B. would work　 C. have worked　 D. am working