What the boy enjoys to have a room of his own.A. beingB. to beC. isD. are

问题补充：

What the boy enjoys to have a room of his own.

A. being

B. to be

C. is

D. are

答案：

A. being

B. to be

(答案→)C. is

D. are

解析：而不选A。what the boy enjoys 是主语从句，空格处填的 is 为谓语动词。