■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”。