【題目】—I've got a headache.
—No wonder.Youin front of the computer too long.
A.work
B.are working
C.have been working
D.worked

【答案】C
【解析】考查時態(tài)。work和are working是一般現(xiàn)在時和現(xiàn)在進(jìn)行時，只說明了現(xiàn)在的情況，而未包含過去的，故排除A和B；而worked只說明了過去，未包含現(xiàn)在，故排除D，只有C用了現(xiàn)在完成進(jìn)行時，既包含了現(xiàn)在，又包含了過去，說明了動作對現(xiàn)在的影響是你頭痛了，C是正確的。

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