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    【题目】I will go on with the experiment unless my mother _____ me to stop.

    A. will ask B. asks C. asked D. has asked

    【答案】B

    【解析】试题分析：句意：除非我妈妈让我停止不然我会继续实验的。Unless引导的是条件状语从句，根据“主将从现”原则，此空应用一般现在时态，所以选B。

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