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    【题目】______ you fully understand the instructions of the experiment, your life won’t be secured.

    A. Unless B. If C. Once D. When

    【答案】A

    【解析】考查连词辨析。A. Unless除非；B. If如果；C. Once一旦；D. When当……时候。句意：除非你完全理解实验的指导，否则你的生命将无法得到保障。表达的是“除非”的意思，故选A。

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