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题型：单选题题类：模拟题难易度：普通

吉林省长春市名校调研系列卷2019年九年级英语第四次模拟测试卷

If everyone ________ his best to protect the environment, the world ________ a better place for people to live in.

A、tried; is B、tries; will be C、tries; is

举一反三

—How is your pet dog?
— He is lovely. But if he _______ at home all day, he _______ at me angrily.

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

I don't know if Tom _________ here tomorrow. If he ________, I'll tell you.

If it tomorrow, we will go on a picnic.

If you a good idea, you keep it to yourself.

You can't pass the exam ________ you study hard.

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