Paul doesn't have to be made . He always works hard.A. learnB. to learnC. learnedD. learni

问题补充：

Paul doesn have to be made . He always works hard.

A. learn

B. to learn

C. learned

D. learning

答案：

A. learn

(答案→)B. to learn

C. learned

D. learning

解析：make sb. do这一句型变成被动语态时为： be made to do