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    5、The professor encouraged his students to make further studies on the earthquake science, __________he had contributed most of his lifetime.  

    A. which                  B. that                         C. to which                        D. for which

    5、C

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    The professor encouraged his students to make further studies on the earthquake science, __________he had contributed most of his lifetime.  

    A. which                  B. that                         C. to which                        D. for which

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