41.My sister’s professor had her______ her paper many times before allowing her to present it to the committee. ( 94.6/49)
　　A. rewrite B. to rewrite C. rewritten D. rewriting

　　42.Silver is the best conductor of electricity, copper______ it closely. (94.6/52)
　　A. followed B. to follow C. following D. being following

　　43.He asked______ since he had been chairman for seven years. (94.6/67)
　　A. not to be re-elected B. to be not re-elected
　　C. not to have been re-elected D. to have not been re-elected

　　44.Homework______ on time will lead to better grades. (95.1/44)
　　A. done B. be done C. having done D. to have been done

　　45.The speech______, a lively discussion started. (95.1/45)
　　A. being delivered B. was delivered
　　C. be delivered D. having been delivered

　　46.______a teacher in a university, it is necessary to have at least a master’s degree. (95.1/48)
　　A. To become B. Became C. One becomes D. One becoming

　　47.It is not unusual for workers in that region_______. (95.1/55)
　　A. to be paid more than a month late B. to be paid later than a month
　　C. to pay later a month more D. to pay later more than a month

　　48.Michael used to look hurt and surprised when_______. (95.1/58)
　　A. Scolding B. to scold C. having scolded D. scolded

　　49.Realizing that he hadn’t enough money and______ to borrow form his father, he decided to sell his watch. ( 95.1/67)
　　A. not wanted B. not to want C. not wanting D. wanting not

　　50.I would appreciate_______ it a secret. ( 95.6/41)
　　A. you to keep B. your keeping C. that you keep D. that you will keep

　　答案：ACAAD　AADCB