The fact has worried many scientists ________the earth is becoming warmer and warmer these years.

A．what

B．which

C．that

D．whose

在窗体中添加一个名称为Text1的文本框和一个名称为Command1的命令按钮，然后编写如下代码： 　　　　 Private Sub Command1_Click( ) Dimaarray1(10，10)As Integer Dim i，j As Integer For i=1 To 3For j=2 T0 4Array1(i，j)=i+jNext j Next i Text1.Text=array1 (2，3)+array1(3，4) End Sub 程序运行后，单击命令按钮，在文本框中显示的值是

A．12

B．13

C．14

D．15