An awful accident_____,however,happen the other day.

题目

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

答案

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．