—Does John serve in the army?—No but hein the army for 8 years.A. would serveB. has serve

问题补充：

—Does John serve in the army?

—No, but hein the army for 8 years.

A. would serve

B. has served

C. is serving

D. served

答案：

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。