It is waste of time for young men to devote themselves to playing computer games on Int

问题补充：

It is waste of time for young men to devote themselves to playing computer games on Internet only for pleasure.

A. /; the; /

B. the; the; /

C. a; the; a

D. a; the; /

答案：

A. /; the; /

B. the; the; /

C. a; the; a

(答案→)D. a; the; /

解析：前面a waste of time/money…”为固定短语；中间为on the Internet，表示特指; 后面为for pleasure=for fun，为固定短语。