Only by reading more books　　　　improve your reading skills. A. you canB. can youC. do youD.

问题补充：

Only by reading more booksimprove your reading skills.

A. you can

B. can you

C. do you

D. you do

答案：

A. you can

(答案→)B. can you

C. do you

D. you do

解析：考查倒装句。Only所修饰的状语位于句首时，主句用部分倒装，即把句子谓语中的助动词、系动词或情态动词提到主语之前，句意：只有通过读更多的书，你才能提高阅读能力。可以应该是情态动词，选B。