题目：
It is reported that very little use of these waste materials_______ in the past decades．
A．was taken
B．was made
C．has been made
D．has been taken
答案：
答案：C
题目分析：考查时态和语态。根据句中时间状语in the past decades在过去的几十年，可知用现在完成时，再根据主语是use，与make之间为被动关系。句意：据报道，这些废材料在过去的几十年里很少利用。故C正确。
