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题型：单选题题类：模拟题难易度：普通

We will have no water to drink _________ we don't protect the earth.

A、until B、if C、unless

举一反三

I ______the film if I'm free next Sunday.

You can buy MP4 ______ you like listening to music.

We _______ have a sports meeting this weekend if it _______.

— I don't know if Mr. Li ________ to the party this evening.

— I think he will come if he ________ free.

If you any question, you Mrs. Smith.

If he the early bus, he there on time.

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