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    The doctor will not perform the operation it is absolutely necessary. A. when B. if C. for D. unless 【查看更多】

     

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    The doctor will not perform the operation ___ it is absolutely necessary.

    A. when               B. if                  C. for                  D. unless

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    The doctor will not perform the operation ___ it is absolutely necessary.

    A. when               B. if                  C. for                  D. unless

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    The doctor will not perform the operation ___ it is absolutely necessary.

    A. when               B. if                  C. for                  D. unless

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    The doctor will not perform the operation ___ it is absolutely necessary.

    A. when               B. if                  C. for                  D. unless

    查看答案和解析>>

    The doctor will not perform the operation ___ it is absolutely necessary.

    A. when               B. if                  C. for                  D. unless

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