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    【题目】He _______ around the clock since June, when the first Ebola case appeared in this agricultural county.

    A. had been working B. has been working

    C. is working D. was working

    【答案】B

    【解析】

    试题分析：考察时态。现在完成进行时表示动作从某一时间开始，一直持续到现在，或者刚刚终止，或者可能仍然要继续下去。该句意思为：自从六月份第一起埃博拉病例出现在这个农业化的村庄那一刻开始，他就夜以继日地扑在工作上，。根据句意，题目中的他从六月份开始不停的工作，这个动作是从那个时候一直持续到现在的。故选B

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