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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

Mike didn't go to bed his father came back.

Mao Dun is Cindy's favourite writer. He died in 1981, his works are still popular today.

The work was hard it took us quite a long time to do it.

I really want to have a pet dog, _______ my mother disagrees.

—I think everyone should play a part in saving our environment.

—I agree. For example, there will be less air pollution ________ we drive less.

Is his mother a teacher ___________ a doctor?

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