■What the boy enjoys _____ to have a room of his own.
A. being B. to be
C. is D. are
【分析】答案选C，而不选A。what the boy enjoys 是主语从句，空格处填的 is 为谓语动词。
■Nothing that he suggested _____ to be of any use.
A. prove B. proved
C. proving D. to prove
【分析】答案选B，而不选C。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。”
■The old house we paid a visit _____ at the top of the hill.
A. standing B. to stand
C. to standing D. to stands
【分析】答案选D。we paid a visit to 是修饰the old house 的定语从句，句中的stands 为主句谓语。
■The life he is now used _____ quite different from ours.
A. is B. to be
C. to being D. to is
【分析】答案选D。句中he is now used to 是修饰 the life 的定语从句，to 后的动词 is 是句子的谓语，句意为“他现在习惯的这种生活与我们的生活很不相同”。
■The work he paid special attention _____ to nothing.
A. came B. to come
C. to coming D. to came
【分析】答案选D。句中的he paid special attention to 是修饰 the work 的定语从句，to 后的动词 came 是句子的谓语，句意为“他特别关注的那项工作泡汤了”。
■The result what he said would lead _____ his regret in the future.
A. is B. to be
C. to being D. to was
【分析】答案选D。句中what he said would lead to 是修饰 the result 的定语从句，to 后的动词 was 是句子的谓语，句意为“他所说的话将导致的结果是他今后的后悔”。