It’s a pity that I was too busy to watch the film last night. If I ____ time. I would have gone to watch it.

A．had

B．had had

C．have

D．would have

下面关于图层的描述哪些是正确的（）

A.任何一个图像图层都可以转换为背景层

B.图层透明的部分是有像素的

C.图层透明的部分是没有像素的

D.背景层可以转化为普通的图像图层