—Does John serve in the army?
—No, but he in the army for 8 years.
A. would serve
B. has served
C. is serving
D. served
网友回答
A. would serve
B. has served
(答案→)C. is serving
D. served
解析：本题时态。句意：约翰在军队服役吗？——不，但是他已经在军队服役八年了。根据下文时间状语for 8 years.，可知下文描述的动作现在已经完成，故用现在完成时态。主语he为单数第三人称，故助动词用单数，选C。原答案有误。