问题补充:
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
答案:
解析:考查现在分词的完成式用法:通过分析句子,后面是主句,前面是分词做状语,因为句意是:排队等了半小时后,汤姆突然意识到他把钱包落在家里了。说明是先等了半小时才发现的,状语和主句的动作有明显的先后关系。用现在分词的完成式。选C。
考点; 考查现在分词的完成式
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