【題目】______ in the queue for half an hour, the old man suddenly realized he had left the check in the car.

A. Waiting B. To wait

C. Having waited D. To have waited

【答案】C

【解析】C 考察狀語和時態(tài)，等的動作已經(jīng)先完成了，他才意識到，并且這里是原因狀語，不定式只能做目的狀語。

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