单选题：Good friends __________ we are, I still find her difficult t..

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Good friends __________ we are, I still find her difficult to understand at times. [ ] A. as
B. because
C. though
D. unless

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________you know how to manage your time,you can try to work..

________you know how to manage your time,you can try to work and look after the children well meanwhile.[ ]A. If onlyB. Even thoughC. As soon asD. Now that

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—You seem to have had that car for years.—Yes, I should sel..

—You seem to have had that car for years.—Yes, I should sell it ________ it breaks down.[ ]A. whileB. afterC. untilD. before

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Most whales must come up for air after several minutes, ____..

Most whales must come up for air after several minutes, ______ a few can stay under water for an hour or more.[ ]A. whileB. orC. forD. so

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It is generally believed that teaching is _____ it is a scie..

It is generally believed that teaching is _____ it is a science.[ ]A. an art much as B. much an art asC. as an art much asD. as much an art as

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_____ the Internet is of great help, I don't think it's a ..

_____ the Internet is of great help, I don't think it's a good idea to spend too much time on it.[ ]A. IfB. WhileC. BecauseD. As

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