_______ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.
A.To wait
B.Have waited
C.Having waited
D.To have waited
C

試題分析:考查現(xiàn)在分詞的完成式用法:通過(guò)分析句子,后面是主句,前面是分詞做狀語(yǔ),因?yàn)榫湟馐牵号抨?duì)等了半小時(shí)后,湯姆突然意識(shí)到他把錢(qián)包落在家里了。說(shuō)明是先等了半小時(shí)才發(fā)現(xiàn)的,狀語(yǔ)和主句的動(dòng)作有明顯的先后關(guān)系。用現(xiàn)在分詞的完成式。選C。
考點(diǎn); 考查現(xiàn)在分詞的完成式
點(diǎn)評(píng):現(xiàn)在分詞做狀語(yǔ)有一般式doing,適用于和主句動(dòng)作同時(shí)發(fā)生的情況,完成式:having done,適用于先于主句動(dòng)作的情況,否定式not doing,在做題時(shí)要注意辨別
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