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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

– Will you go to the party?
– Of course I will if I ______.

——I can hardly believe my eyes. Is that you, Lucy?
——Yes. It has been almost 20 years______ we were together.

About 75 percent of the students can go swimming _____ the rest can't.

His hobby is ______ watching TV ______ playing the piano. It's reading books.

You'll make some mistakes in your homework if you {#blank#}1{#/blank#}(be not ) careful.

He______ until the meeting is over.

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