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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 were four years ago.

the correct answer:

There is now one microcomputer for every thirty-two pupils,four times as many as there were

请问比较四年前拥有的电脑为什么不用　there was  而是用there were 呢？因为四年前应该是there was one microcomputer for every 128 pupils吧？

谢谢

Reference:

http://forum.chasedream.com/dispbbs.asp?boardid=23&replyid=729795&id=26698&page=1&skin=0&Star=1

Just in case you get confused:

1) four times as many as .... 是修饰其之前的整个句子的

2) there are four times as many computers today as there were four years ago