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请教英语考试题,急,Children have to stay at home when there is a typh

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请教英语考试题,急,
Children have to stay at home when there is a typhoon,_________?(这道题我选的C,正确答案是B,但前半句不是有have吗,为什么不能用它提问)
A don't children B don't they C haven't they D haven't children
Danny does some ________ twice a week(review)这道题的答案是revision 我写的是 reviews为什么错了
请教英语考试题,急,Children have to stay at home when there is a typh
第一题,have to的have并不是助动词,而是被视为实意动词,疑问或否定需借助do/does的相关形式;

第二题,review做“复习”讲时,通常是动词,some则修饰名词,因此用它的名词形式revision