问题补充:
单选题Wefeltamazedattheusethewastebottles.A.they had madeB.they had made ofC.they had putD.they had put to
答案:
B解析本题使用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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