题目内容：

It's reported that a car accident happened last night ,killing several passengers,___?
A.is it B.isn't it
C.didn't it D.did it

优质解答

选B,分清主语 谓语 就一目了然 it是主语,is是谓语,后面接了个宾语从句,所以反问的话,是isn't it