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题型：单选题题类：常考题难易度：普通

— May we leave the classroom now?
— No, you _______. You _______ to leave until the bell rings.

A、mustn't; are allowed B、can't; aren't allowed C、don't have to; are allowed D、needn't; aren't allowed

举一反三

You ________ wait for him. I'm not sure whether he'll come back or not today.

The environment in our hometown is getting worse and worse. So many trees .

My brother is{#blank#}1{#/blank#}(不能做某事的)to drive a car．Let's ask Danny for help．

—Must I babysit my little sister on Sunday at home?

— No, you __________.

—I wonder if these are Danny's glasses.

—They be Danny's. He doesn't wear glasses.

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