--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
考察情態(tài)動詞的用法。句意：現(xiàn)在我們就要把垃圾拿出去嗎？-不，沒必要，你們可以下課后再拿出去。Must的否定有兩種:mustn’t;needn’t。Mustn’t 表示禁止做某事；needn’t 沒必要做某事。根據(jù)句意，可知選D。
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