—Excuse me, could you please lend me your MP4 player?

—____. [ ]

A. Certainly! It's here.              

B. Yes, you can.

C. Sure, with pleasure.              

D. Not at all.

AutoCAD中，热键F9或组合健CtrL+B是切换（）开关。

A、栅格命令

B、目标捕捉工具命令

C、捕捉命令

D、正交命令