-- I have got a headache.
-- No wonder. You_________ on the math exercises too long.
A．workB．a(chǎn)re workingC．have been workingD．worked
C

試題分析:句意：-我有點(diǎn)頭疼。-難怪呢。你這么長(zhǎng)時(shí)間一直在做數(shù)學(xué)練習(xí)。根據(jù)語境可知說話人強(qiáng)調(diào)動(dòng)作的持續(xù)性和影響性，應(yīng)該用現(xiàn)在完成進(jìn)行時(shí)，故答案選C。
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