问题补充：
Only by following this method.
A. we can study English well
B. can we be able to study English well
C. can we study English well
D. study English well can we
答案：
A. we can study English well
B. can we be able to study English well
(答案→)C. can we study English well
D. study English well can we
解析：only引导的状语提前，句子要倒装。B项中的can不能与be able to连用。
