题目内容
13．---May I play computer games now，mum？---No，you _______．You haven't finished your homework yet．（ ）
| A． | don't | B． | needn't | C． | can't | D． | may not |
分析 --妈妈，我现在可以玩电脑游戏吗？
--不，你不可以，你还没有完成作业呢．
解答 答案：C．
结合选项可知本题考查情态动词，首先明确选项中每个单词的意思：B：没必要；C：不能/不可以； 注意英语中一般不使用may not，根据设空处后面的You haven't finished your homework yet，结合题干推测答语句意是""不，你不可以，你还没有完成作业呢．，所以can't 符合句意，故选C．
点评 本题考查了情态动词的用法．解答时首先根据题干明确句意，理解所给选项中每个情态动词的意思并熟练掌握它们的用法，便可作出正确选择．
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