问题
选择题
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
答案：D
题目分析：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。
点评：时态的考查要抓关键词本题的关键词是ever since，故与现在完成时连用。