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】

試題分析：考察時(shí)態(tài)�，F(xiàn)在完成進(jìn)行時(shí)表示動(dòng)作從某一時(shí)間開始，一直持續(xù)到現(xiàn)在，或者剛剛終止，或者可能仍然要繼續(xù)下去。該句意思為：自從六月份第一起埃博拉病例出現(xiàn)在這個(gè)農(nóng)業(yè)化的村莊那一刻開始，他就夜以繼日地?fù)湓诠ぷ魃�，。根�?jù)句意，題目中的他從六月份開始不停的工作，這個(gè)動(dòng)作是從那個(gè)時(shí)候一直持續(xù)到現(xiàn)在的。故選B

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