Only by working hard succeed.A. can youB. you canC. could youD. you could

问题补充：

Only by working hard succeed.

A. can you

B. you can

C. could you

D. you could

答案：

(答案→)A. can you

B. you can

C. could you

D. you could

解析：考查倒装句。Only的倒装句必须满足两个条件：only放在句首，并且强调状语。句子中没有过去时的时间状语，所以C错误。句意：只有努力工作，你才能成功。