He had collected plenty of historical evidence,       proved that humans used to have different sleeping patterns.

A．that

B．which

C．it

D．what

单击命令按钮时，下列程序的执行结果为（ ）。　　Private Sub Command1_Click()　　　Dim x As Integer，y As Integer　　　x=12：y=32　　　Call Proc(x，y)　　　Print x；y　　End Sub　　Public Sub Proc(n As Integer，ByVal m As Integer)　　　n=n Mod 10　　　m=m Mod 10　　End Sub

A．12 32

B．2 32

C．2 3

D．12 3