Time should be made use meaningful things.
A. of to do
B. of doing
C. to do
D. doing
网友回答
(答案→)A. of to do
B. of doing
C. to do
D. doing
解析：考查词组和不定式：句意：时间应当被好好利用来学习有意义的东西。短语 make good use of sth to do 充分利用某事去做...这个短语的被动语态是：sth be made good use of，后面的不定式to do表目的状语，选A。