题目内容
---May I step on the grass?
---No, you _______. Look at the sign “Keep off the grass”. Everyone should be responsible for protecting the environment.
A.may not B.mustn’t C.needn’t
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题目内容
---May I step on the grass?
---No, you _______. Look at the sign “Keep off the grass”. Everyone should be responsible for protecting the environment.
A.may not B.mustn’t C.needn’t