定语从句

题目

定语从句
The engineers made two big plans for the dam,____ was never put in force.
A.one of them B.which C.one of which D.every one of which
问题在于C和D 由于从句用的是was 我就选的D在我看来选C 的话which指plans 从句应该用were 而D选项解决了这点 可是答案是C

答案