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

问题补充：

Paul doesn’t 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 sth 的被动式为 sb be made to do sth(某人被迫做某事)。