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    2. Can you imagine the difficulty that he had _____ the problems?

    A. to work out　　　　　　　　　 B. work out

    C. worked out　　　　　　　　　 D. working out

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    第一节：单项选择。(每小题1分，共20分)

    1. This is a _____ book that you may _____ in daily English study.

    　 A .referring; refer to　　　　　　　 B. referring; refer

    C. reference; refer to　　　　　　　 D. reference; refer

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