题目内容

－Dad, may I watch TV?
－No, you can’t. You _______ finish your homework first.
A. must     B. can      C. may  
A
考查情态动词。must表示“必须”；can表示“有某种能力”；may表示“可以”。根据文意：你不能看电视，你必须先完成作业。用must。故选A。
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