Peter graduated from university in 1998. He in a high school ever since.A. worksB. is wor

问题补充：

Peter graduated from university in 1998. He in a high school ever since.

A. works

B. is working

C. worked

D. has worked

答案：

A. works

B. is working

C. worked

(答案→)D. has worked

解析：考查时态。根据关键的时间状语。Ever since从那以后，与现在完成时连用，故D正确。