题目内容

--Must we take out the trash now?
--       .You can do it after class.
A．Yes, you must.B．No,you can’t
C．Yes, you may. D．No, you needn’t
D
考察情态动词的用法。句意：现在我们就要把垃圾拿出去吗？-不，没必要，你们可以下课后再拿出去。Must的否定有两种:mustn’t;needn’t。Mustn’t 表示禁止做某事；needn’t 没必要做某事。根据句意，可知选D。
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