14．Since nobody gave him any help，hemust have finished（must finish） the research on his own completely．

分析 由于沒有人給予他任何幫助，他肯定是完全獨(dú)立地完成這項(xiàng)研究．

解答 答案是must have finished．本題考查表示推測(cè)的情態(tài)動(dòng)詞的用法．must表示推測(cè)時(shí)常見的三種結(jié)構(gòu)：1）must be doing對(duì)正在進(jìn)行的動(dòng)作的推測(cè)； 2）must be 對(duì)現(xiàn)在的狀態(tài)的推測(cè)；3）must have done對(duì)過去的或已經(jīng)發(fā)生的事件的推測(cè)．由上文的動(dòng)詞過去式gave推斷本題是對(duì)過去的事件的推測(cè)，故選用must have done 的結(jié)構(gòu)，答案用must have finished．

點(diǎn)評(píng) 本題表示推測(cè)的情態(tài)動(dòng)詞的用法．要在理解表示推測(cè)的情態(tài)動(dòng)詞的基本用法的基礎(chǔ)上結(jié)合語(yǔ)境判斷．

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