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【题目】2018年上海崇明二模it's common knowledge that leaves change from green to brown____autumn.

A. at B. on C. by D. in

【答案】D

【解析】句意:树叶在秋天从绿色变成棕色是常识。本题考察时间介词。A. at在,在具体的点刻;B. on在,表示在具体某一天;C. by之前;D. in ,在一段时间内。in+季节,在一段时间内。故选:D。

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