John shut everybody out of the kitchen _____ he could prepare his grand surprise for the party.[ ]

A. which

B. when

C. as if

D. so that

在不同的运行着的应用程序之间切换，可以利用快捷键( )。

A．Alt+Esc

B．Ctrl+Esc

C．Alt+Tab

D．Ctrl+Tab