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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，他肯定是完全獨立地完成這項研究．

解答 答案是must have finished．本題考查表示推測的情態(tài)動詞的用法．must表示推測時常見的三種結構：1）must be doing對正在進行的動作的推測； 2）must be 對現(xiàn)在的狀態(tài)的推測；3）must have done對過去的或已經發(fā)生的事件的推測．由上文的動詞過去式gave推斷本題是對過去的事件的推測，故選用must have done 的結構，答案用must have finished．

點評 本題表示推測的情態(tài)動詞的用法．要在理解表示推測的情態(tài)動詞的基本用法的基礎上結合語境判斷．

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