C.
happen是不及物动词,没有被动语态.这句话的意思是：我不知道我在睡觉时发生了什么.
I have no idea what _____when I was asleep.A is happening B did happen C happened D was happened
I have no idea what _____when I was asleep.A is happening B did happen C happened D was happened
英语人气：203 ℃时间：2019-12-13 18:10:09
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