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题型：单选题题类：模拟题难易度：普通

北京市海淀区2018届高三英语第二次模拟考试试卷

You don't need an invitation to help others. Give help _____you are asked.

A、if B、as C、though D、before

举一反三

Why do you want a new job __________ you have got such a good one already?

_____ the Internet is making people closer, it may also be breaking some homes or will cause other family problems.

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

Sales of CDs have greatly increased since the early 1990s, when people _____to enjoy the advantages of this new technology.

Fortunately, someone who happened to be passing by called the fire department {#blank#}1{#/blank#} (instant) the fire broke out.

I was about to give up {#blank#}1{#/blank#}my father came and encouraged me to keep going.

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