English is too hard for some people.
A. to be master
B. to master it
C. to master
D. master
网友回答
A. to be master
B. to master it
(答案→)C. to master
D. master
解析：在easy, hard, difficult, light, heavy, interesting, dangerous, fortable, important, fit, pleasant, nice ,good等形容词后的不定式用主动形式表示被动意思。