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

試題分析:考查情態(tài)動(dòng)詞。A能夠；B必須； C可以；D應(yīng)該。固定短語：if you must“如果非這樣的話”表示說話人的不情愿。句意：--媽媽，我可以再看15分鐘電視嗎？--哦，如果你非要看就看吧。
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