书名：新多益听力阅读超高分黄金试题2000题
页数：Reading,p.73 第119题
题目：
Most importantly,clients of Toka can use this product at the same cost
_______ traditional environmentally-unfreidly materials.
(A) along
(B) as
(C) that
(D) with
疑问：答案是(B),为什么(D)不行?(B)的答案如何解释呢?
谢谢!