---- You look tired. ---- Yeah I since 4 o’clock.A. had playedB. have been playingC. am

问题补充：

---- You look tired.

---- Yeah, I since 4 o’clock.

A. had played

B. have been playing

C. am playing

D. have been played

答案：

A. had played

(答案→)B. have been playing

C. am playing

D. have been played

解析：本题的含义是你看起来累了。是的，我自从4点钟就一直玩到现在，表示过去的事一直持续到现在，而且现在正在进行，可用完成进行时，结构为have been doing，故本题选B。