Jeremy Lin __________ an unknown basketball player in New York Knicks for quite a long time.

A．used to be

B．used to being

C．is used to be

D．was used to be

在色版设计中，具有明显色向的色块，应该用（）为衬底.

A.灰色

B.其同类色向的淡色

C.和这种色块明度相同的颜色

D.选择画面总色调