You look tired!Yes,I ----compurter games for two hours.选什么,为什么?You look tired!Yes,I ----compurter games for two hours.A,play.B,was playing.C,have been playing.D,am playing选什么,为什么?

You look tired!Yes,I ----compurter games for two hours.选什么,为什么?You look tired!Yes,I ----compurter games for two hours.A,play.B,was playing.C,have been playing.D,am playing选什么,为什么?
You look tired!Yes,I ----compurter games for two hours.选什么,为什么?
You look tired!
Yes,I ----compurter games for two hours.
A,play.B,was playing.C,have been playing.D,am playing
选什么,为什么?

You look tired!Yes,I ----compurter games for two hours.选什么,为什么?You look tired!Yes,I ----compurter games for two hours.A,play.B,was playing.C,have been playing.D,am playing选什么,为什么?
C,
play是一般现在时,突出不了现在的意味；was playing是过去进行时,是纯粹的过去,和现在无关联；am playing只是片面地说明了现在的情况,这三个答案都和时间状语的for two hours不符合,因为这两个小时里有纯粹过去的时间,还有刚刚过去的时间以及此时此刻的时间,而have been playing是现在完成进行时,它所对应的时间正好和for two hours完美呼应了.

C
完成时态的用法 have been playing： 我已经
译：你看起来很累，我已经在电脑前玩了2个小时的游戏

C\
主要因为答语中出现了 For two hours
这是完成时的标志
只能选完成时