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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（安徽卷）

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

A、Once B、Since C、Though D、Unless

举一反三

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

My brother wants to leave the company as it is ________ I would like to expand it.

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

Jack is determined to get a seat for the concert it means standing in a queue all night.

“You can't judge a book by its cover,” {#blank#}1{#/blank#} the old saying goes.

Whenever he comes again,he'll be welcomed.

{#blank#}1{#/blank#} he comes again,he'll be welcomed.

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