You look tired!Yes,I ----compurter games for two hours.选什么,为

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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.
再问：谢谢，不过有一个小问题，是不是因为tired，表明对自己有影响，所以选现在完成进行时，可我个人认为，既然是for two hours，那正在进行时am playing因该也可以说得过去吧，，，
再答： am playing不能和表示一段时间的状语for two hours连用的；因为这两个小时里有过去的时间，可在am playing中却找不到过去的时间，am playing表明的是纯粹现在的时间。

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