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    【题目】Now that the problem ________, appropriate action can be taken, and final success will be seen.

    A. is identifiedB. was identified

    C. has been identifiedD. had been identified

    【答案】C

    【解析】

    试题分析：句意：既然问题已经被鉴别，就应该采取合适的行动，也会看到最后的结果。根据语境和句意，这里用现在完成时的被动语态，故选C。

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