— Beibei, is Mr. Chen in the office?
— No. He        for half an hour.
A. left                   
B. has left           
C. has been away
C

試題分析：句意：貝貝，陳老師在辦公室嗎？——不。他已經(jīng)出去半個小時了。結合語境可知下文描述的是一直持續(xù)到現(xiàn)在的動作，left表示瞬間動作，故選C。
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