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题型：单选题题类：常考题难易度：普通

牛津译林版九年级英语上Unit 6 TV programmes 单元测试

The rivers will become dirtier and dirtier_______ we take action to protect them.

A、since B、if C、until D、unless

举一反三

- I'm going to the post office.
-_______ you're there , can you get me some stamps?

________ my father _______ my mother is able to drive a car. However, they are going to buy one.

—Can you play the guitar?

—Sorry. ______ I can sing some English songs.

Air pollution is becoming more and more serious, ________ action must be taken to stop it.

My grandparents wrote letters to keep in touch with others they were young.

Mr. Hu's class is _______________ interesting _______________ everyone likes his lessons.

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