题目内容
7．You _____ watch TV，but you have to clean the room first．（ ）| A． | must | B． | can | C． | can't |
分析 你可以看电视，但是你必须先打扫房间．
解答 答案：B．must一定，必须；can可以；can't不可能．根据but you have to clean the room first，可知你必须先打扫房间，打扫完房间你可以看电视．can可以．故选B．
点评 本题考查了情态动词的用法．熟知句意以及所给选项的意思是解答本题的关键．
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