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—May I watch TV for another 15 minutes, Mum?
—Oh, dear, if you _____.
A.canB.mustC.mayD.should
B

试题分析:考查情态动词。A能够;B必须; C可以;D应该。固定短语:if you must“如果非这样的话”表示说话人的不情愿。句意:--妈妈,我可以再看15分钟电视吗?--哦,如果你非要看就看吧。
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