-- What is the function of the mouse?
-- It the cursor(光标) on the screen.
A. is used for moving
B. is used to moving
C. is using for moving
D. used to move
网友回答
(答案→)A. is used for moving
B. is used to moving
C. is using for moving
D. used to move
解析：考查短语：被用来做某事be used for doing sth，过去常常做某事used to do,J句意：鼠标的作用是什么？它被用来在屏幕上移动光标。故选A