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Each button, when ____, provides a piece of beautiful music.
A.clicked
B.having clicked
C.clicking
D.being clicked

试题分析:句意:每个按钮当被点击的时候,都会有一首优美的音乐。这里使用了状语从句的省略,完整的句子是when each button is clicked,it provides a piece of beautiful music.当主从句的主语一致的时候,可以省略从句的主语和be动词,所以选A。
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