Windows 7 中， 选择多个不连续的文件或文件夹， 应首先选择一个文件或文件夹，然后按（  ）键依次单击需要选择的文件或文件夹。 
A、Tab
B、Esc 
C、Shift
D、Ctrl 

A．Frost’s poems look simple, direct and natural, but Frost was almost never as simple, direct and natural as he appeared to be.
B．Frost’s poems are never simple, direct and natural.
C．Frost’s poems are simple, direct and natural.
D．Frost’s poems never say much in little.‍