问题
选择题
We felt amazed at the use the waste bottles.
A．they had made
B．they had made of
C．they had put
D．they had put to
答案
答案：B
本题使用make use of短语的被动形式，先行词use在定语从句中作made的宾语，句意为“我们对他们对废酒瓶的利用感到吃惊”。
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