when did the accident happen?_____a winter morningA:in B:At C:On D:For
问题描述:
when did the accident happen?_____a winter morningA:in B:At C:On D:For
答
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