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—Mum,       I watch TV now ?
—No, you        finish your homework first.
A.may, needB.can, have toC.do, mustD.may , must
B

试题分析:句意: -妈妈,现在我可以看电视吗?-不,你必须先完成你的家庭作业。may 或can 可以表示征求别人的许可;need 需要;have to 必须,不得不;must 必须;根据句意可知选B。
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