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题型：单选题题类：真题难易度：普通

—The air pollution is so terrible.—It will be worse we do something to protect the environment.

A、if B、unless C、after D、when

举一反三

The teacher speaks very loudly ___ all the students can hear her.

I'm going to stay at home it's raining outside.

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

My father spends much money on books, _____ he's not rich.

—Which skirt do you________, the blue one ________ the red one?

— I like the red one.

Emily, you are playing video games again! Study hard, ______ you will fail in the coming exam.

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