（2015•贵州遵义） A: Mum, may I go out to play football for an hour? B: No, you_ . The air outside is not very clean.

题型：单选题题类：真题难易度：普通

A: Mum, may I go out to play football for an hour? B: No, you_ . The air outside is not very clean.

A、can't B、needn't C、couldn't

举一反三

— Yes, I _______.

— Goldfish are a good choice. You ________ feed them every day

—It _________ be him. He has gone abroad.

—Not yet. We ____go to Dalian. It's a good place for vacation.

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