Question

They had to stay at home because of the heavy rain,_________?

A.hadn't they B.didn't they C.did they D.had they 我选了A，但是答案是B，为什么呢?

Answer 1

B对，前肯后否。
因为had
to是
have
to
过去时，其否定句要加助动词didN‘t
，反意疑问句也一样
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