【題目】Detective Lu told us the victim was last seen _______ his office at about 7 p.m. yesterday.

A.leaveB.leftC.leavingD.to leave

【答案】C

【解析】

句意：陸偵探告訴我們，受害者最后一次被看到是在昨天晚上7點(diǎn)左右離開他的辦公室。

考查現(xiàn)在分詞作主語補(bǔ)足語。leave動(dòng)詞原形；left過去式和過去分詞；leaving動(dòng)名詞，現(xiàn)在分詞；to leave動(dòng)詞不定式；see sb. do 看見某人做某事，目睹了某人做某事的全過程；see sb. doing 看見某人正在做某事，它的語句環(huán)境是“主語對(duì)象”恰巧看到了某人正在實(shí)施某事，強(qiáng)調(diào)的是看見的這么一個(gè)動(dòng)作，是一個(gè)瞬間發(fā)生的事情；根據(jù)“at about 7 p.m. yesterday”可知是那個(gè)時(shí)間發(fā)生的事情，所以用doing；結(jié)合“was last seen”可知是被動(dòng)語態(tài)，所以此處是缺doing，故選C。

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