对OG 089的正确答案的怀疑

OG89.        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（C）

(E) every thirty-two pupils now has one microcomputer, four times as many as

OG 解释Choices A, B, and C appropriately use the construction “one X for every thirty-two Y’s” to describe the ratio of computers to pupils, but only C, the best answer, is error-free. In A, are does not agree with the subject, one microcomputer; furthermore, in A, B, and D, than is used where as is required. Choices D and E reorder and garble the “one X...” construction, making four times as many refer illogically to pupils.

as many as 平行可以推出是C选项. 但是,我觉的C选中应该是was而不是were ? 大家认为呢?