单选题：窗体的MouseDown事件过程 Form_MouseDown（ButtonAsInteger,ShiftAsInteg

题目分类：VB
题目类型：单选题
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题目内容：

窗体的MouseDown事件过程
Form_MouseDown（ButtonAsInteger,ShiftAsInteger,XAsSingle,YAsSingle）
有4个参数，关于这些参数，正确的描述是（　　）。 A．通过Button参数判定当前按下的是哪一个鼠标键
B．Shift参数只能用来确定是否按下Shift键
C．Shift参数只能用来确定是否按下Alt和Ctrl键
D．参数x,y用来设置鼠标当前位置的坐标

参考答案：

答案解析：

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