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    Don’t be afraid of asking for help ___________ it is needed.

    A．unless B．since C．when D．although

    C

    解析试题分析：A. unless除非，如果不，B. since既然，自从，C. when当…时候，D. although虽然，句意：当有需要的时候，不要害怕求助。所以选C。
    考点：考查连词辨析

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