题目内容
17．-Hi，Jack!Could you come to our English party？-Sorry，I ．I have to look after my little sister at home．
| A． | must | B． | could | C． | can't |
分析 --嗨，Jack！你能来参加我们的英语晚会吗？
--抱歉，我不能．我必须在家照顾我妹妹．
解答 答案：C．
must一定，必须；could可能；can't不可能．根据Sorry和I have to look after my little sister at home，可知这里应该是作出否定回答．can't不可能．故选C．
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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