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【题目】________April 22nd, people around the world celebrate Earth Day in different ways.

A.InB.OnC.AtD.By

【答案】B

【解析】

句意:在四月22日,世界各地的人们以不同的方式庆祝地球日。

考查介词辨析。in后面接不是具体的某一天;On后面接具体的某一天;At后面接某一时刻;By不迟于,根据所给空后面的April 22nd是具体的某一天,所以用on,故选B

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