题目内容
2．-Must I finish my homework after school，Mr．Green？-No，you ．You may go home now，but you go to the net bar （网吧）．（ ）
| A． | mustn't；don't have to | B． | needn't；mustn't | ||
| C． | must；need | D． | need；must |
分析 --放学以后我必须完成作业吗，Green小姐？
--不，你不必．你现在可以回家了，但是不可以去网吧．
解答 答案：B．
根据No，you ，You may go home now，可知你可以现在回家了不必放学以后就完成作业，在这里是作出否定回答．由must引导的一般疑问句表示否定回答时需要用needn't或don't have to来回答．再根据but you go to the net bar，可知这里不可以去网吧，所以这里用mustn't．故选B．
点评 情态动词的考查．回答以must引导的一般疑问句，肯定回答用Yes，Sb must．"是的，…必须"；否定回答用No，Sb needn't"不，…不必"．
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