16. The three men tried many times to sneak across the border into the neighboring country (　) by the police each time.

　　A.had been captured

　　B.being always captured

　　C.only to be captured

　　D.unfortunately captured

　　【答案】C

　　17.It was not until I came here ______I realized this place was famous for not only its beauty but also its long history.

　　A. who

　　B. that

　　C. where

　　4D. before

　　【答案】B

　　18.______ that advance seems to be following advance on almost a monthly basis .

　　A.So rapid is the rate of progress that

　　B.Rapid as the rate of progress is that

　　C.So rapid is the rate of progress as

　　D.Rapid as the rate of progress as

　　【答案】A

　　19.There ____ be any difficulty about passing the road test since you have practiced a lot in the driving school.

　　A.mustn’t

　　B.shan’t

　　C.shouldn’t

　　D.needn’t

　　【答案】C

　　20. Sunburn can be just _______a heat burn.

　　A. as serve

　　B. severe

　　C. as severe as

　　D. severe as

　　【答案】C