These books will be______ helpful to those who wish to improve their English.

[      ]

A. exactly

B. particularly

C. generally

D. honestly

Photoshop中Ctrl+T是自由变换的快捷键，在有一个选区的情况下，按Ctrl+T键必须依靠快捷键才能够完成下列哪些变换操作。

A.缩放

B.旋转

C.透视变形

D.扭曲