问题补充:
in the ticket hall for almost an hour, I suddenly realized I had left my ID card home.
A. To wait
B. To have waited
C. Waiting
D. Having waited
答案:
A. To wait
B. To have waited
C. Waiting
(答案→)D. Having waited
解析:考查非谓语动词。因为wait这个动作发生在realize这个动作之前,又因为主句的主语I与wait之间是主动关系,故要用现在分词的完成式,答案为D。
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