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题型：单选题题类：常考题难易度：普通

安徽省阜阳市第九中学2018届九年级上学期英语期末考试试卷

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

“You can have some cakes, ______ you must wash your hands first.”Mum says.

——The air pollution is terrible.
——It will be worse ________ we take action to protect the environment.

_______ the teacher was very busy, _______he still helped me with my English.

My brother doesn't like playing basketball __________ watching TV.

Zootopia, the cartoon, is popular there are many lovely animals in it.

Mr. Green is very rich. , he doesn't feel happy.

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