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    20. ________ I cannot understand is ________ she wants to resign her present job.

    A. What; why 　　　　　　 　　　　B. Which; how 　　　　 　C. That; why　 　　 　D.What; because

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    19. ________ the website of the Fire department in your city, and you will learn a lot about firefighting.

    A. Having searched 　　B. To search 　 　　　C. Searching 　　　　　　　　　 　　D. Search

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    18. He appears to be optimistic, but, ________, he is quite pessimistic.

    A. in other words 　　　　　　　 　　B. on one hand　 　　 C. for one thing 　　 　　D. as a matter of fact

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