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题型：单选题题类：常考题难易度：普通

高中英语->牛津译林版->高二上册->模块6Unit 4 Helping people around the world

________a teacher has given permission is a student allowed to enter the classroom.

A、If only B、Only if C、As if D、Even if

举一反三

He had his camera ready ________he saw something that would make a good picture.

If {#blank#}1{#/blank#}(admit) to the company, you will receive strict training before you start to work.

Success always hides behind the next comer in the road, so you will never know how close it lies you turn the corner.

There are fewer and fewer tigers in the world. The situation will continue ________ humans stop killing them for fur and bones.

You can phone your friend at work _____ you don't make a habit of it.

_____ we ever meet again I hope he remembers to thank me.

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