22. _________ in the queue for half an hour, the old man suddenly realized he had left the cheque in the car．

　　A．Waiting　　　　　　　　　　B．To wait

　　C．Having waited　　　　　　　D．To have waited

______ in the queue for half an hour, the old man suddenly realized he had left the cheque in

the car.

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

 ______ in the queue for half an hour, the old man suddenly realized he had left the cheque in the car.

A. Waiting     B. To wait    C. Having Waited   D. To have waited

________ in the queue for half an hour, the old man suddenly realized he had left the cheque in the car.

  A. waiting         B. Having waited        C. To have waited        D. To wait

_____in the queue for half an hour, the old man suddenly realized he had left the purse in the office.

        A. Having waited   B.Waiting   C.to wait    D. To have waited