I am not sure if youin the exam but you will be better if youharder.A. succeed; workB. su

问题补充：

I am not sure if youin the exam, but you will be better if youharder.

A. succeed; work

B. succeed; will work

C. will succeed; work

D. success; would work

答案：

A. succeed; work

B. succeed; will work

(答案→)C. will succeed; work

D. success; would work

解析：句意：我不确信你是否能通过考试，但是如果你努力学习你会做得更好。结合语境可知前文描述的是将要发生的动作，故用将来时态。下文从句描述的是客观的动作，故用一般现在时态。选C。