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-- I have got a headache.
-- No wonder. You_________ on the math exercises too long.
A.workB.are workingC.have been workingD.worked
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。
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