in the ticket hall for almost an hour, I suddenly realized I had left my ID card

       inthe ticket hall for almost an hour, I suddenly realized I had left my ID cardhome.

A. To wait            B.To have waited     C.Waiting           D. Havingwaited

试题答案

【答案】

D

【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。