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    Unexpected difficulties in the course of their experiment. A. arises B. were arising C. arose D. were arisen 【查看更多】

     

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    Unexpected difficulties ____in the course of their experiment.

    A. arises　　　 B. were arising　　　 C. arose　　　 D. were arisen

     

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    Unexpected difficulties ____in the course of their experiment.

    A. arises　　　 B. were arising　　　 C. arose　　　 D. were arisen

     

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