Nothing that he suggested to be of any use.
A. prove
B. proved
C. proving
D. to prove
网友回答
A. prove
(答案→)B. proved
C. proving
D. to prove
解析：句子主语是 nothing，that he suggested 是修饰主语的定语从句，suggested 的宾语是引导该定语从句的关系代词 that，而不是其后的动词；句子谓语是 proved。全句意为“他建议的情况没有一条是有用的。”