问题补充：
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：
A. was taken
B. was made
(答案→)C. has been made
D. has been taken
解析：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。
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