there be 句型 there是主语么？

可是在http://forum.chasedream.com/GMAT_SC/thread-103101-1-1.html这篇精华帖子中举例
There be 句型等同于一般的主谓宾俱全的句型
OG89
There is one PC for every 32 pupils in American four time as many as there were four years ago(主语比较)
There is one PC for every 32 pupils in American  four time as many as  DVD player(宾语比较)
There is one PC for every 32 pupils in American four time as many as  for school teachers.(介宾比交)
There is one PC for every 32 pupils in American four time as many as  in china(介宾比较)


第一句是主语比较，很显然是there当作主语。。。
该题原题为
89. A recent national study of the public schools shows that there are now one microcomputer for every thirty-two pupils, four times as many than there were four years ago.
A.    there are now one microcomputer for every thirty-two pupils, four times as many than there were
B.    there is now one microcomputer for every thirty-two pupils, four times as many than there were
C.    there is now one microcomputer for every thirty-two pupils, four times as many as there were
D.    every thirty-two pupils now have one microcomputer, four times as many than there were
E.    every thirty-two pupils now has one microcomputer, four times as many as




选c
求解答。。。
-- by 会员 莞尔jasmine (2012/9/16 14:11:32)