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：考查句型：It’s high time that+主语+过去式/should do ，should不能省略。所以选C。