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题型：单选题题类：模拟题难易度：普通

I am going to Tian'anmen Square to watch the raising of the national flag with Lin Tao it rains early tomorrow morning.

A、when B、if C、since D、unless

举一反三

I stayed at home. I ___________ went to the park ___________ to the cinema.

—The plane won't take off ______ the thick clouds move away.

—Let's wait patiently for the announcement from the airport.

We all like Mr. Zhou ______ he is so kind to us.

— What are you going to do tomorrow?

—I'll ride a bike if it ______ I like riding on rainy days.

You ______ a toothache unless you ______ your teeth every day.

________ you go walking in the mountains, you must wear proper shoes.

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