作业帮when did the accident happen?_____a winter morningA:in B:At C:On D:For
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when did the accident happen?_____a winter morningA:in B:At C:On D:For
when did the accident happen?_____a winter morningA:in B:At C:On D:For
when did the accident happen?_____a winter morningA:in B:At C:On D:For
正确答案是happened用一般过去时态.六楼的解释很到位.事故的发生都用happen B B 选择B A项意思不对 C项可改成happened A B 都可以
A（肯定的）
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