– I have got a headache.
--No wonder. You ___in front of that computer too long.
A．workB．a(chǎn)re workingC．have been workingD．worked
A
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，A是正確的。
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