-- I have got a headache.
-- No wonder. You on the math exercises too long.
A. work
B. are working
C. have been working
D. worked
网友回答
A. work
B. are working
(答案→)C. have been working
D. worked
解析：
试题分析:句意：-我有点头疼。-难怪呢。你这么长时间一直在做数学练习。根据语境可知说话人强调动作的持续性和影响性，应该用现在完成进行时，故答案选C。