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    many times, he finally managed to settle the problem. A. Tried B. Trying C. Having been tried D. Having tried 【查看更多】

     

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    _______ many times, he finally managed to settle the problem.

    A. Tried　　 B. Trying　　 　　　 C. Having been tried　 D. Having tried

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    _______ many times, he finally managed to settle the problem.

    A. Tried　　　 　　　 B. Trying　　 　　　 C. Having been tried　 D. Having tried

     

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