题目内容
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
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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