To learn English well we should find opportunities to hear English as much as we canA.

问题补充：

To learn English well, we should find opportunities to hear English as much as we can．

A. speak

B. speaking

C. spoken

D. to speak

答案：

A. speak

B. speaking

C. spoken

D. to speak

解析：本句中hear的宾语是English，应该是“被说”的。