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

試題分析：句意：每個按鈕當被點擊的時候，都會有一首優(yōu)美的音樂。這里使用了狀語從句的省略，完整的句子是when each button is clicked，it provides a piece of beautiful music.當主從句的主語一致的時候，可以省略從句的主語和be動詞，所以選A。
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