【題目】 ______ around the clock for two days，David managed to finish the report for the manager on schedule.

A. Working B. Worked

C. Having worked D. To work

【答案】C

【解析】

試題分析：考查非謂語(yǔ)動(dòng)詞。本句考查非謂語(yǔ)動(dòng)詞擔(dān)當(dāng)狀語(yǔ)。在擔(dān)當(dāng)狀語(yǔ)時(shí)，需要和主句主語(yǔ)之間存在一定的邏輯關(guān)系。本句主語(yǔ)為David，和動(dòng)詞work之間存在主動(dòng)發(fā)出的關(guān)系。故選項(xiàng)B錯(cuò)誤。再根據(jù)主句句意：David按時(shí)為經(jīng)理完成了報(bào)告�？芍�，在完成報(bào)告之前，他日以繼夜地工作了兩天，故選擇C，表在主句謂語(yǔ)動(dòng)詞之前發(fā)生。

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