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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

_________I have to give a speech, I get extremely nervous before I start.

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

{#blank#}1{#/blank#}scientists have learned a lot about the universe, there is much we still don't know.

No matter {#blank#}1{#/blank#} busy you are, he always insists on coming with you.

It could be that she is having serious {#blank#}1{#/blank#}(conflict) with other students or at home. {#blank#}2{#/blank#} it is, I know I need to inquire and assess {#blank#}3{#/blank#} is going on.

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