问题补充:
Mr. Liu for ten minutes.
A. has left
B. will leave
C. has been away
D. left
答案:
A. has left
B. will leave
(答案→)C. has been away
D. left
解析:句意:刘先生已经走了10分钟了。根据for ten minutes要用现在完成时,而leave是瞬间动词,后面不能接一段时间;has been away离开,表状态,可以接一段时间,故选C。
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