18．--He promised to come to see you．
--But he          ．Uve been atl alone．（　�。�
A．doesn'tB．isn'tC．hasn'tD．won't

分析 句意：-他答應(yīng)來看我的．-但是他還沒有來，我一直一個(gè)人．

解答 根據(jù)句意說明到現(xiàn)在為止他還沒來，我一個(gè)人在這里．現(xiàn)在完成時(shí)表示過去發(fā)生的動(dòng)作持續(xù)到現(xiàn)在，對(duì)現(xiàn)在有一定的影響；而一般過去時(shí)只描述過去發(fā)生的事情，不強(qiáng)調(diào)對(duì)現(xiàn)在的影響，故選C．

點(diǎn)評(píng) 現(xiàn)在完成時(shí)與一般過去時(shí)的區(qū)別是時(shí)態(tài)考查的重點(diǎn)內(nèi)容．現(xiàn)在完成時(shí)表示過去發(fā)生的動(dòng)作持續(xù)到現(xiàn)在，對(duì)現(xiàn)在有一定的影響；而一般過去時(shí)只描述過去發(fā)生的事情，不強(qiáng)調(diào)對(duì)現(xiàn)在的影響．

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