题目内容
-Must we clean the library before class?
-No, you ________.But you ________ do it after school.
[ ]
A.needn’t; must
B.mustn’t; can
C.needn’t; may
D.mustn’t; may
答案:C

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题目内容
-Must we clean the library before class?
-No, you ________.But you ________ do it after school.
A.needn’t; must
B.mustn’t; can
C.needn’t; may
D.mustn’t; may