Jack please don’t play the CD or please . Father is sleeping.OK. No problem.A. t

问题补充：

--- Jack, please don’t play the CD, or please . Father is sleeping.

--- OK. No problem.

A. turn it down

B. turn down it

C. turn it up

D. turn up it

答案：

(答案→)A. turn it down

B. turn down it

C. turn it up

D. turn up it

解析：turn down关小，调低；turn up出现，开大。句意：杰克，请不要播放CD，或者请你把它关小一点。父亲正在睡觉。当人称代词做动词加副词构成的动词短语的宾语时，人称代词要放在动词后面，副词前面。结合语境可知选A。