◎ 题干
It's difficult _____ English well. We must work hard.

[     ]

A. learn
B. learns
C. study
D. to learn
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“It's difficult _____ English well. We must work hard. [ ]A. learn B. learns C. study D. to learn …”主要考查了你对  【不定式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。