47.  

(A) 1998 saw several new ventures promoting online distance learning both at the college and graduate level, but also faculty members in large numbers began

(B) In 1998 several new ventures were promoting online distance learning for both college-and for graduate-level courses, but it was also a year for a large number of faculty members who began

(C) With several new ventures promoting online distance learning both for college and graduate courses in 1998, it was also a year when a large number of faculty members had begun

(D) Although 1998 saw several new ventures promoting online distance learning for both college- and graduate-level courses, it was also a year when a large number of faculty members began

(E) Several new ventures were promoting online distance learning in 1998, at both the college level as well as the graduate, but it was also a year for faculty members to begin in large numbers

答案是D, 请问B哪里错，谢谢!

A but also 和 not only 搭配，一般不单独用

B 后边的it应该指代1998

C 同样

D 没什么大错误，it指代明确

E 同B

这个题,一个both...and的用法可以排除4个,

both and前后的部分都是要平行的,注意介词在both的前面还是后面,然后

and的前后也要一致

both and前后的部分都是要平行的,注意介词在both的前面还是后面,然后and的前后也要一致。 这个说法很有帮助.