Ten minutes has been made full of the problem.
A. using ; studying
B. use ; to study
C. to use ; to study
D. use ; studying
网友回答
A. using ; studying
(答案→)B. use ; to study
C. to use ; to study
D. use ; studying
解析：考查句子结构。本题是一个被动语态，主动形式是make use of ten minutes.变成了被动语态Ten minutes has been made use of.后面的不定式表示目的状语。句意：为了了解这个问题，10分钟的时间已经被充分利用了。故B正确。