单项选择题

已知有下面过程 Private Sub proc1(a As Integer,b As String,Optional x As Boolean) End Sub 正确调用此过程的语句是【】

A．Call proc1(5)
B．Call proc1 5," abe ",False
C．proc1(12,"abe",True)
D．proc15,"abe"

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单项选择题

单项选择题

已知有下面过程 Private Sub proc1(a As Integer,b As String,Optional x As Boolean) End Sub 正确调用此过程的语句是【 】