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问题: I have no idea what ____________while I was asleep

I have no idea what ____________while I was asleep.
A happened B had happened C was happened D has happened
为什么A是正确的


谢谢

解答:

因为发生在过去,和was asleep同时,所以排除B
happen,take place都没有被动,排除C
本句不强调发生的事对现在的影响,只是陈述“不知道”这么一回事,所以用过去时就行了,排除D
选A