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You'betterwhenyou'rewithyourfamilyA.notsmokeB.nottosmoke选什么?请说明理由

题目详情
You' better _____ when you're with your family A.not smoke B.not to smoke 选什么?请说明理由
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答案和解析
选A.
you'd better (not)+ 动词原形.这是固定句型.