选择题：当点击鼠标或者拖动鼠标时，触发的事件是下列的哪一个？(A)KeyEvent(B)ActionEven

题目内容：
当点击鼠标或者拖动鼠标时，触发的事件是下列的哪一个？
(A) KeyEvent (B) ActionEvent
(C) ItemEvent (D) MouseEvent
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