Nothing that he suggested to be of any use.A. prove B. proved C. proving D. has been prov

问题补充：

Nothing that he suggested to be of any use.

A. prove

B. proved

C. proving

D. has been proved

答案：

A. prove

(答案→)B. proved

C. proving

D. has been proved

解析：句意：他提的建议证明对我们没有用。这里he suggested是定语从句，整个句子的主语是nothing，所以这里缺少谓语动词；根据suggested判断谓语动词应该用过去式，故选B。