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【题目】They have to work at once, _______?

A. can they B. can’t they C. don’t they D. haven’t they

【答案】C

【解析】句意:他们必须马上工作,不是吗?反义疑问句,前面是肯定句,后面是否定形式,have to

是一般现在时,用助动词don’t。故此处为don’t they,故选C。

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