Only by hard work learn English well.A. you canB. can youC. you could D. could you

问题补充：

Only by hard work learn English well.

A. you can

B. can you

C. you could

D. could you

答案：

A. you can

(答案→)B. can you

C. you could

D. could you

解析：考查倒装。Only +状语开头句子采用部分倒装，又因叙述的是事实谓语动词要用一般现在时。故选B