C. To have been ignored D. Having been ignored
20.After being rescued from the air-crash, the people agreed that they had much to_____.(92.1/65)
A. thank B. be thanked C. be thankful D. be thankful for
21.The money will be used to keep a space vehicle on the moon busy_____ back to the earth
photographs and other information about the surface of the moon. (92.6/45)
A. to send B. being sent C. to be sent D. sending
22.Building that railway was very difficult and involved_____ ten tunnels. (92.6/58)
A. dig B. having dug C. to have dug D. digging
答案
ADCAA CACBB BCDCD DADDDDD