Question

-- 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

Answer 1

C

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。