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

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：句意：保罗没有必要被强迫学习，他总是很刻苦。这里是make sb do sth强迫某人做某事，它的被动式 sb be made to do，故选B。