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题型：单选题题类：真题难易度：普通

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

A、so B、but C、or D、until

举一反三

About 75 percent of the students can go swimming _____ the rest can't.

Lily Tom is going with you because one of them must stay at home.

I don't like physics ______ it's too difficult for me.

—Time is up. I have to go now.

—Oh, it's raining heavily outside. You'd better wait here ______ it stops.

I like playing football , _________Jack doesn't. He likes watching TV.

Some questions in the exam are _______ difficult that ______ students can work them out.

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