Only by practicing every day English well.A. can we learnB. we can learnC. did we learnD.

问题补充：

Only by practicing every day English well.

A. can we learn

B. we can learn

C. did we learn

D. learn we

答案：

(答案→)A. can we learn

B. we can learn

C. did we learn

D. learn we

解析：句意：每天只有通过实践，才能把英语学好。Only位于句首时需使用部分倒装，本句的时态应使用现在时态。