_______ 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：通過分析句子，后面是主句，前面是分詞做狀語，因為句意是：排隊等了半小時后，湯姆突然意識到他把錢包落在家里了。說明是先等了半小時才發(fā)現(xiàn)的，狀語和主句的動作有明顯的先后關(guān)系。用現(xiàn)在分詞的完成式。選C。
考點; 考查現(xiàn)在分詞的完成式
點評：現(xiàn)在分詞做狀語有一般式doing，適用于和主句動作同時發(fā)生的情況，完成式：having done，適用于先于主句動作的情況，否定式not doing，在做題時要注意辨別
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