对比两道题。OG 652.92和白勇语法。159.28。17号考试

白勇语法。159.28

Once the economic usefulness of the motor car was demonstrated and with its superiority to the horse being porved, much of th early hostility to it in rural regions disappeared.

a. with its superiority to the horse being

b. and its superiority over the horse had been

c. and its superiority to the horse

d. its superiority over the horse

e. with its superiority over the horse being

选择B

对比OG 652.92

Health officials have ordered that the levels of bacteria be measured and the results published.

And 前后如果都用be，第二个必须省略。

这个理论第二个适用。

可第一个的C选项，看成省略了be,即and its superiority to the horse （be）proven

为啥不对呢？？

谢谢

http://forum.chasedream.com/dispbbs.asp?BoardID=23&replyID=3321757&id=373618&skin=0

mm看这个帖子。