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题型：单选题题类：真题难易度：普通

试题来源：2017年高考英语真题试卷（北京卷）含听力

______ birds use their feathers for flight, some of their feathers are for other purposes.

A . Once B . If C . Although D . Because

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组卷次数：191次 +选题

举一反三

—Patrick, we are going to try some new methods to promote the sales of the new products.

—Good, but be sure to suit the customers' needs, ________ method you choose.

We still have a long way to go _________ our project has been carried out smoothly so far.

Your parents are always there by you, _____you need them.

You must get a good night sleep first, ____much work you have to do.

_________ the Silk Road covered a huge distance ________ modern day Xi'an with the Middle East and Europe, today one area in particular is associated with the name of the Silk Road.

Try she might, Sue couldn't get the door open.

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