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题型：单选题题类：常考题难易度：普通

安徽省合肥一中、马鞍山二中等六校教育研究会2017-2018学年高一上学期英语开学考试试卷

Everyone can make great progress______he works hard.

A、unless B、as long as C、when D、while

举一反三

You won't find paper cutting difficult _____you keep practicing it.

I'll be out for some time. ______ anything important happens, call me up immediately.

_____the damage is done, it will take many years for the farmland to recover.

_______ you can sleep well, you will lose the ability to focus, plan and stay motivated after one or two nights.

—Will you go to the picnic tomorrow?

—Not my dear dog is allowed to accompany me.

You can phone your friend at work _____ you don't make a habit of it.

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