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题型：单选题题类：常考题难易度：普通

—Would you like to play tennis with me _________ it doesn't rain tomorrow?
—Sure, _________ I am busy.

A、if; since B、whether; but C、 if; unless D、because; until

举一反三

—____ the workers are very tired, _____they keep on working.
— They are great. We must learn from them.

—Will you come______have a drink with me?
—I'd love to, _______I'm too busy these days.

I was ill, I went to school as usual.

________ Tom ________ Mary speaks good Chinese, so they can communicate with these Chinese students very well.

Go to see a doctor ________ you are ill.

_______ Mr. Smith is very busy, he still spends time with his old parents on weekends.

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