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.
E,(1)我觉得错在has, 原句表达一种存在而不是主动拥有, (2)而且E中four times as many as 补充说明什么呢??是every thirty-two pupils还是one microcomputer??似乎不如one microcomputer for every thirty-two pupils,(一个比例)是four times as many as there were(另一个比例)表达清楚