题目内容
2．Finish your homework first，then you'll surf the Internet for half an hour．（ ）| A． | can | B． | need | C． | be able to | D． | may |
分析 句意：先完成作业，然后你可以上网半小时．
解答 答案：C．
can，能，会need，需要be able to能，可以，may，可能．根据 you'll-surf the Internet for half an hour，可知在这里will是情态动词，后面跟动词的话应该用动词原形，在这里be able to是可以的意思．故选C．
点评 can 和be able to 都可以表示能力．can泛指一般的能力，而且只有两种形式，即：can，could．be able to 则主要指具体做到了某件事的能力．
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