If you keep on working hard you are sure to in your career.A. go awayB. get off C. go ahe

问题补充：

If you keep on working hard, you are sure to in your career.

A. go away

B. get off

C. go ahead

D. get ahead

答案：

A. go away

B. get off

C. go ahead

(答案→)D. get ahead

解析：短语辨析。A离开；B下车；C前进；D走在前面；进步，取得成功；句意：如果你继续努力，在你的事业上你一定会取得成功的。根据句意说明D正确。