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

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

(答案→)C. spoken

D. to speak

解析：考查宾语补足语。动词hear的宾语是English，宾语与speak之间构成被动关系，故使用过去分词spoken.故C正确。