English is not easy .A. learningB. to learnC. to be learnedD. learned

问题补充：

English is not easy .

A. learning

B. to learn

C. to be learned

D. learned

答案：

A. learning

(答案→)B. to learn

C. to be learned

D. learned

解析：考查非谓语动词。作表语的形容词easy，hard, difficult, heavy等等，后用不定式做状语，用主动表示被动，所以选B.