题目内容
【题目】Technological developments have also played their part ______ keeping Valentine’s Day relevant in the 21st century. Valentine’s ecards have been very popular in recent years.
【答案】in
【解析】
试题分析:in 考查介词。paly a part in doing sth.在……起作用,介词in表示在某一方面,故填in。
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