6. —I have got a headache.
问题描述：
6. —I have got a headache.
—No wonder. You_________ in front of that computer too long. (2007江西)
A. workB. are working C. have been workingD. worked
怎么选为什么
答
C
work和are working是一般现在时和现在进行时,只说明了现在的情况,而未包含过去的,故排除A和B；而worked只说明了过去,未包含现在,故排除D,只有C用了现在完成进行时,既包含了现在,又包含了过去,说明了动作对现在的影响是你头痛了,是正确的.