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题型：单选题题类：常考题难易度：普通

北京市石景山区2018届高三上学期英语期末考试试卷

The government has taken some measures to reduce the smog, but it may be some time _____ the situation improves.

A、since B、when C、unless D、before

举一反三

____ the damage is done, it will take many years for the farmland to recover.

The number of stay-at-home fathers reached a record high last year, new figures show, _______ families saw a rise in female breadwinners.

One Friday, we were packing to leave for a weekend away ______ my daughter heard cries for help.

—Did you tell him that we've put off the meeting?

—No. He rushed out ________ I could say anything.

Mike used to be a top student, but he has fallen behind ________ he lost himself in playing computer games.

When they {#blank#}1{#/blank#}(reach) the station, the train had already left.

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