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题型：单选题题类：常考题难易度：普通

鲁教版（五四制）八年级上册Unit 4 An old man tried to move the mountains. Period 2 Section A (3a-4c)同步练习

The river will become dirtier and dirtier ____________ we take action to protect it.

A、since B、if C、until D、unless

举一反三

Remember to return the book to the school library in time, _______ you will be fined (罚款).

— When are you going to Taiwan this summer?

— ________ I have finished school. I can go any time.

Hamburgers are nice, ________ I don 't eat them often.

Mo Yan's books have been sold out in many book stores his winning of the Nobel Literature Prize.

I wonder ____ June is a good time to visit Hong Kong.

______________ it is often cold in the mountains, you need to wear warm clothes.

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