Question

_______ in the queue for half an hour, Tom suddenly realized that he had left his wallet at hom...

_______ 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

Answer 1

C

试题分析：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 点评：现在分词做状语有一般式doing，适用于和主句动作同时发生的情况，完成式：having done，适用于先于主句动作的情况，否定式not doing，在做题时要注意辨别