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    42. The doctor did _______ to save his brother’s life.

    A. all what he could　　 　　　　　　　B. as much as possible

    C. all could be done　　　 　　　　　　　 D. as much as could

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    41. Our elder son has been ______ Africa for several months.

    　 A. knocking about　　 B. knocking down　 　 C. knocking over　　　　　　　 D. knocking off

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    40. _____ he would have succeeded in the exams.

    A. If he has worked hard　　　 　　　　　 B. If he works hard

    C. Did he work hard　　　 　　　　　 D. Had he worked hard

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