It ______ long befor the Chinese Space Center ______ Shenzhou VII Spacecraft,becoming the third country to send an astronaut to "walk" in space after the United States and the former Soviet Union (now Russia).

A．will not be,launches

B．was not,launched

C．will be,launches

D．was not,had launched

有如下事件过程。 Private Sub Form_KeyDown(KeyCode As Integer，Shift As Integer)If(Button And 3)=3 Then Print "OK"End If End Sub 程序运行后，为了在窗体上输出“OK”，应当按下的鼠标键是

A．左键

B．右键

C．同时按下左键和右键

D．按什么都不显示