OG SC89 教えて下さい

投稿者:ケンス
投稿日時:2003年10月16日 02時05分24秒

(SC-89)
A recent national study of the public schools shows that <there are now one micro computer for every thirty-two pupils, four times as many than htere 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

C)が○ですが、as の後では、there were という複数形を示す動詞が使われているのですが、前半ではthere is で単数形を示す動詞が使われています。何故なんでしょうか?

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