问题
选择题
---- 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
答案：B
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。