单击命令按钮时，下列程序的执行结果是 Private Sub Command1_Click() Dim a As Integer，b As Integer，c As Integer a=3:b=4:c=5 Print SecProc(c,b,a) End Sub Function FirProc(x As Integer，y As Integer，z As Integer) FirProc=2*x+y+3*z End Function Function SecProc(x As Integer，y As Integer，z As Integer) SecProc=FirProc(z,x,y)+x End Function

A．20

B．22

C．28

D．30