--I’m worried about my English. harder you will catch up with your classmates.A. Work

问题补充：

--I’m worried about my English.

-- harder you will catch up with your classmates.

A. Working; and

B. To work; or

C. Work; and

D. Worked; or

答案：

A. Working; and

B. To work; or

(答案→)C. Work; and

D. Worked; or

解析：本题考查祈使句及连词的用法。祈使句是以动词原形开头，故用Work; and意为“然后”；or意为“或者”，答语句意“努力工作然后你将赶上你的同学”。故选C。