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题型：单选题题类：模拟题难易度：普通

北京市房山区市2017届高三下学期英语第一次模拟考试试卷

_____ I make a promise to help others, I will manage to complete it.

A、Although B、Once C、Unless D、Before

举一反三

You can borrow my car you promise not to drive too fast.

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.

It is so cold that you can't go outside_____ fully covered in thick clothes.

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

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

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