题目内容
10．-Will you stay here for dinner？-Sorry，I _________．I'll have to meet my aunt at the airport．（ ）| A． | mustn't | B． | can't | C． | needn't | D． | don't |
分析 --你能留在这里吃晚饭吗？
--对不起，我不能，我要去飞机场接我姑姑．
解答 答案：B．mustn't禁止，不可以，在英语中不能用于表示推测；can't在这里表示做某事能力，意为"不能"；needn't不必；don't，do not的缩写．根据I'll have to meet my aunt at the airport，可知我要去飞机场接我姑姑，所以不能留在这里吃晚饭．can't不能．故选B．
点评 本题考查了情态动词的用法．解答时要认真审题，结合所给出的语境，正确把握说话者的语气、情感、态度、观点等．其次要认真思考所给选项中情态动词的基本特征和用法，并结合语境推敲答案．
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