It's high time that we students even harder at our lessons as the national entrance examination is ing nearer.
A. work
B. will work
C. worked
D. have to work
网友回答
A. work
B. will work
(答案→)C. worked
D. have to work
解析：考察虚拟语气。固定句式It is time that sb should do sth/过去时；是某人做某事的时候了。句意：因为高考即将来临，是我们学生努力学习的时候了。故C正确。