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题型：单选题题类：真题难易度：普通

2015年高考英语真题试卷（北京卷）

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

A、Until B、Unless C、Once D、Although

举一反三

Don't call me at the office ________ it is necessary.

She says that she'll have to close the shop ________ business improves.

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

_________ we don't stop climate change, many animals and plants in the world will be gone.

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

With the Entrance Exam approaching, I feel more and more stressed. It will ruin my college dream _____ I take action now as soon as possible.

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