87.The diet of the ordinary Greek in classical times was largely vegetarian-vegetables,fresh cheese,oatmeal,and meal cakes,and meat rarely.

(A)and meat rarely

(B)and meat was rare

(C)with meat as rare

(D)meat a rarity

(E)with meat as a rarity

答案是E

C为什么不可以呢?

Choice C is unidiomatic.

 这里需要一个独立主格结构，以with开始的表示紧密逻辑关系的独立主格结构一般表

现为：

 with + n. + -ed/-ing

 with + n. +adj.

 with + n. +介词短语

 此处 as rare不能组合为介词短语

 所以说是 unidiomatic 的。