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题型：单选题题类：真题难易度：普通

2017年高考英语真题试卷（北京卷）含听力

If you don't understand something, you may research, study, and talk to other people _______ you figure it out.

A、because B、though C、until D、since

举一反三

______ scientists have learned a lot about the universe, there is much we still don't know.

It won't be long ______ you regret what you have done.

It will be quite a long time _______ she is back again, so don't be too cross with her.

________ the Internet is bridging the distance between people, it may also be breaking some home or will cause other family problems.

The roof fell _____he had time to dash into the room to save his baby.

—Take a cigarette, please.

—No, thanks. It's three years {#blank#}1{#/blank#} I smoked.

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