-Hi.Jack!Could you come to our English party?-Sorry.I ．I have to look after my little sister at home．A．mustB．couldC．can't 题目和参考答案——青夏教育精英家教网—

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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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