[讨论]

When rates were raised in 1985, postal service officials predicted they would make further rate increase unnecessary for at least three years.

(A) they would make further rate increases uncessary

(B) they would mean that further rate increases would not be needed

(C) that it would not be necessary for further increases unnecessary

(D) that the increase would make further rate increases unnecessary

(E) further rate increases will not be needed

答案是D,C为什么不对？

我没选C，主要是因为 xxx not be necessary for further increases unnecessary 读起来别扭