[-A60] ______ in the queue for half an hour,the old man suddently realized he had left

题目

[-A60] ______ in the queue for half an hour,the old man suddently realized he had left
the cheque in the car.
A.Waiting
B.To wait
C.Having waited
D.To have waited
翻译并分析

答案

翻译：在队伍里面排了半个小时的队之后,这个老人突然意识到把支票忘在车里了.
1.不定式放句首,一般只表示目的“为了..”,则句意不通,“为了排半个小时的队伍,老人家突然意识到...
由此排除BD；
2.所以选用现在分词短语做时间状语.
考查状语动作wait和谓语动词realized之间的关系,很明显,前者发生在后者之前,即“先排了半个小时的队之后,才突然意识到...”,所以必须选用现在分词的完成式having waited.
由此排除A,答案C为正解.