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题型：单选题题类：真题难易度：普通

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

A、if B、unless C、until D、when

举一反三

It was raining heavily, _____ we decided to stay at home and watch TV.

Our world will get better and better each of us lives a greener life.

My mother doesn't like stories _____have sad endings.

It gets cold at night. ______________ you don't wear your coat, you'll catch a cold.

— How many uncles do you have?

— I ________ have one.

— I'm wondering she is willing to do it.

— Don't worry. I don't doubt ________she can do it well.

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