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1.( )Amy has to finish her homework before 9.00m,______?

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1.( )Amy has to finish her homework before 9.00m,______?
A.hasn't she B.doesn't she
为什么选B不选A
2.relax与relaxed的区别
eg.help you relax
feel relaxed
1.have to 是个词组,意为不得不,这里的have是个实义动词,不是助动词,因此否定用does
2.relax是动词,例子是这个词组help sb do sth,relaxed是形容词,feel后可接形容词