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 Fir Proc(x As Integer，y As Integer，z As Integer) Fir Proc=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