The bark of some species of oak trees yields substance used in ____ leather.
A.treatingB.to treatC.its treatmentD.it treats在线课程A
解析:
介词后面只能跟动词的v+ing形式。不必十分清楚这句话的意思,便可选定A. treating。而因为缺少介词of引导的短语of leather,故不能使用C. its treatment中的名词treatment构成词组:in treatment of leather(最好说:in leather treatment)。
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