OG 10,31，49，58,96 的解释不是很懂，求帮助

10.The widely accepted big bang theory holds that the universe began in an explosive instant ten to twenty billion years ago and has been expanding ever since.

(A) that the universe began in an explosive instant ten to twenty billion years ago and has been expanding

(B) that the universe had begun in an explosive instant ten to twenty billion years ago and had been expanding

(C) that the beginning of the universe was an explosive instant ten to twenty billion years ago that has expanded

(D) the beginning of the universe to have been an explosive instant ten to twenty billion years ago that is expanding

(E) the universe to have begun in an explosive instant ten to twenty billion years ago and has been expanding

31.Unlike the conviction held by many of her colleagues that genes were relatively simple and static, Barbara McClintock adhered to her own more complicated ideas about how genes might operate, and in 1983, at the age of 81, was awarded a Nobel Prize for her discovery that the genes in corn are capable of moving from one chromosomal site to another.

(A) Unlike the conviction held by many of her colleagues that genes were

(B) Although many of her colleagues were of the conviction of genes being

(C) Contrary to many of her colleagues being convinced that genes were

(D) Even though many of her colleagues were convinced that genes were

(E) Even with many of her colleagues convinced of genes being

49.The automotive conveyor-belt system, which Henry Ford modeled after an assembly-line technique introduced by Ransom Olds, reduced from a day and a half to 93 minutes the required time of assembling a Model T.

(A) from a day and a half to 93 minutes the required time of assembling a Model T

(B) the time being required to assemble a Model T, from a day and a half down to 93 minutes

(C) the time being required to assemble a Model T, a day and a half to 93 minutes

(D) the time required to assemble a Model T from a day and a half to 93 minutes

(E) from a day and a half to 93 minutes, the time required for the assembling of a Model T

58.That educators have not anticipated the impact of microcomputer technology can hardly be said that it is their fault  : Alvin Toffler, one of the most prominent students of the future, did not even mention microcomputers in Future Shock, published in 1970.

(A) That educators have not anticipated the impact of microcomputer technology can hardly be said that it is their fault

(B) That educators have not anticipated the impact of microcomputer technology can hardly be said to be at fault

(C) It can hardly be said that it is the fault of educators who have not anticipated the impact of microcomputer technology

(D) It can hardly be said that educators are at fault for not anticipating the impact of microcomputer technology

(E) The fact that educators are at fault for not anticipating the impact of microcomputer technology can hardly be said

96.Even though Clovis points, spear points with longitudinal grooves chipped onto their faces, have been found all over North America, thev are named for the New Mexico site where thev were first discovered in 1932.

(A) Even though Clovis points, spear points with longitudinal grooves chipped onto their faces, have been found all over North America, they are named for the New Mexico site where they were first discovered in 1932.

(B) Although named for the New Mexico site where first discovered in 1932, Clovis points are spear points of longitudinal grooves chipped onto their faces and have been found all over North America.

(C) Named for the New Mexico site where they have been first discovered in 1932, Clovis points, spear points of longitudinal grooves chipped onto the faces, have been found all over North America.

(D) Spear points with longitudinal grooves that are chipped onto the faces, Clovis points, even though named for the New Mexico site where first discovered in 1932, but were found all over North America.

(E) While Clovis points are spear points whose faces have longitudinal grooves chipped into them, they have been found all over North America, and named for the New Mexico site where they have been first discovered in 1932.