题目内容
— Beibei, is Mr. Chen in the office?
— No. He for half an hour.
A. left
B. has left
C. has been away
C
解析试题分析：句意：贝贝，陈老师在办公室吗？——不。他已经出去半个小时了。结合语境可知下文描述的是一直持续到现在的动作，left表示瞬间动作，故选C。
考点：考查时态辨析
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