_____around the clock for two days，he managed to finish the report for the manager on schedule．

A．Working B．Worked

C．Having worked D．To work

C

【解析】考查現(xiàn)在完成時時態(tài)，現(xiàn)在完成時表示的是過去發(fā)生的事對現(xiàn)在造成的影響。一般情況下有for two days，for+一段時間與現(xiàn)在完成時連用。句意：他已經(jīng)日以繼夜的工作了兩天了，終于為經(jīng)理成功地按時完成了報告。故選C。

考點：考查時態(tài)。

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