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题型：单选题题类：模拟题难易度：普通

Our dreams won't come true __________ we know what our dreams are.

A、after B、unless C、while D、since

举一反三

—May I go swimming this afternoon?
— I'm afraid not _______ you have finished your homework.

—What a heavy haze! The air pollution is terrible now.

—It ________ worse unless we ________ action to protect the environment.

_______ you don't go to bed early, you can't get up early tomorrow.

I don't know if it tomorrow. If it I won't go there.

If Mr Green is free tomorrow, he{#blank#}1{#/blank#}(come) to your birthday party.

If he ___________ work, his family will live a better life.

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