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An awful accident_____,however,happen the other day.

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An awful accident_____,however,happen the other day.
A.does B.did C.has to D.had to答案是B,为什么?我没弄懂它的句型是什么
An awful accident_____,however,happen the other day.
答案B
本题由时间状语the other day确定,句中必须用过去时,排除A、C项;D项意义不当.此处应选B项,表示强调谓语动词occur.全句意为“不过,前几天的确发生了一起可怕的事故”.副词however隔开了did与occur,增加了试题难度.