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    30．　　　　 the meeting himself gave them a great deal of encouragement．

    　A．The president will attend　　 　　　 B. The president to attend

    　C．The president attended 　　　　 　　D. The president’s attending

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    29. As a beginner in English, we should acquire as much knowledge as possible, ________ our communication skills.

    A. which are based　 B. upon which are based 　C. which are based upon　 D. to which are based

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    28．I can think of many cases ___ students obviously knew a lot of English words and expressions but couldn’t write a good essay.

    A. why　　 B. which　　　　　　 C. as　　　 D. where

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