问道老题。。。

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  （ANSWER）
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

我明白其他的语法点，也知道其他几项错在哪，但我就是没想清楚最后there were的用法，为什么不是there was。。。虽然似乎不是这道题的考点，还是烦请大家赐教。

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