---- You look tired.
---- Yeah, I ________ since 4 o’clock.
A．had playedB．have been playingC．a(chǎn)m playingD．have been played
B
本題的含義是你看起來(lái)累了。是的，我自從4點(diǎn)鐘就一直玩到現(xiàn)在，表示過(guò)去的事一直持續(xù)到現(xiàn)在，而且現(xiàn)在正在進(jìn)行，可用完成進(jìn)行時(shí)，結(jié)構(gòu)為have been doing，故本題選B。
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