42. A good many proposals were raised by the delegates, _____ was to be expected.
A. that B. what C. so D. as

43. He was such a _____ speaker that he held our attention every minute of the three-hour lecture.
A. specific B. dynamic C. heroic D. diplomatic


50. The continuous rain _____ the harvesting of the wheat crop by two weeks.
A. set back B. set off C. set out D. set aside


56. Computer technology will _____ a revolution in business administration.
A. bring around B. bring about C. bring out D. bring up


66. So far, _____ winds and currents have kept the thick patch of oil southeast of the Atlantic coast.
A. governing B. blowing C. prevailing D. ruling

68. As the old empires were broken up and new states were formed, new official tongues began to _____ at an increasing rate.
A. bring up B. build up C. spring up D. strike up


68. As the old empires were broken up and new states were formed, new official tongues began to _____ at an increasing rate.
A. bring up B. build up C. spring up D. strike up


请大家帮忙讲解下应该选哪个

42.D。as引导非限制性定语从句，这是一个非限定性定语从句。
as指代前面说的一句话A good many proposals were raised by the delegates。
43.B。dynamic 意指活力四射的，从句子的意思可以看出这个演讲者的演讲很有活力和吸引力，所以吸引大家的注意
50.A。set back：耽搁，延缓；推迟。set off:出发,动身,引起,使发生;set out：开始，陈述，阐明；set aside：挑出,拨出,留出;拒绝。根据句子意思：因为下雨所以收获延期了两周。
56.B。bring around:使信服;bring out：使…显示出来；公布;bring about:引起；bring up教育,培养,使成长。
句子意思：电脑技术将会在商业管理上引发一场革命。
66.C。prevailing winds流行性季风。整句话意思是：流行季风和洋流至今还将厚厚的油块控制在大西洋东南部。也可以用排除法确定答案。
68.C。bring up：教育,培养,使成长。 build up：渐积聚，集结；逐步建立；增进，增强；spring up: 突然出现;迅速生长;strike up:开始演奏。意思很明了了：由于新政府的建立，官方的口舌也开始也很快的速度迅速生长。