---- You look tired.
---- Yeah, I ________ since 4 o’clock.
A．had playedB．have been playingC．am playingD．have been played
B
本題的含義是你看起來累了。是的，我自從4點鐘就一直玩到現(xiàn)在，表示過去的事一直持續(xù)到現(xiàn)在，而且現(xiàn)在正在進行，可用完成進行時，結構為have been doing，故本題選B。
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