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dingzhiyin19

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

(A) they would make further rate increases unnecessary

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

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

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

(E) further rate increases will not be needed

解释上说C错是因为it无指代, 可it可以做形式主语啊.

C还有其他的错误吗?

谢谢大家.

LHL888

对啊

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

futher rate increases (it) would not be necessary.

casualwark11

形式主语就必须能够在句子中找到它对应的部分，例如It is difficult to say，it是形式主语，指代to say。