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---I have got a headache.
----No wonder .You _______in front of that computer too long .
A.work B.are working C.have been working D.worked
C
考察时态。句意:我头疼。——不足为奇。你在电脑前工作的太久了。可知叙述的是已经完成的一直在进行的动作,故用完成进行时,选C。
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