题目内容
8．-Must I feed the goldfish now？-No，you ______．But you must do it before supper．（ ）
| A． | needn't | B． | mustn't | C． | don't | D． | can't |
分析 --我现在必须喂金鱼吗？
--不，你不必．但是在晚饭之前你一定要喂．
解答 答案：C．needn't不必；mustn't不可以；don't，do not的缩写；can't不可能．根据No，you ，But you must do it before supper，可知现在不必喂，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．故选A．
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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