—I have got a headache.
—No wonder. You __________ in front of that computer too long.
A．workB．a(chǎn)re working
C．have been workingD．worked
. C。
由于在電腦前工作太久，所以導(dǎo)致了現(xiàn)在頭痛的結(jié)果，故空格處應(yīng)填現(xiàn)在完成時(shí)或現(xiàn)在完成進(jìn)行時(shí)，即答案選C。
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