Tom as well as his friends ____ to visit our school soon after they arrive in Changsha.

A．is coming

B．are coming

C．will have come

D．has come

在窗体上画 1 个命令按钮，其名称为 Command1，然后编写如下程序：Private Sub Command1_Click() Dim a(10) As IntegerDim x As IntegerFor i=1 To 10a(i)=8+i Next x=2Print a(f(x)+x) End SubFunction f(x As Integer)x=x+3f=xEnd Function程序运行后，单击命令按钮，输出结果为______。

A．12

B．15

C．17

D．18