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题型：单选题题类：真题难易度：容易

——Your grandfather often does Tai Chi in the park.——Yeah, bad weather stops him.

A、when B、since C、unless D、because

举一反三

We still gave the boy another chance ______he made some mistakes.

My sister I are tidy, my brother isn't.

Before you ask someone for help, find out ________ he is the right person for your problem.

I think this kind of mobile phone will be fashionable this year,_____ I'm not completely(完全地)sure.

This young man doesn't have much money, ______ he has many good friends.

—The air pollution is terrible.

—It will be worse ______ we take action to protect the environment.

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