摘要： I have no idea what while I was asleep. A. has happened B. was happened C. happened D. had happened
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? I have no idea what _____ while I was asleep.
A. has happened? ????????????? B. could happen? ????????????? C. had happened? ????????????? ????????????? D. happened
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I have no idea what _____ while I was asleep.
A. has happened B. could happen C. had happened D. happened
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I have no idea what ________ while I was asleep.
A. happened B. had happened
C. was happening D. has happened
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