◎ 题干
We have a difficult time ______ so many subjects.

A. to learn
B. learning
C. learns
D. learned
◎ 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“We have a difficult time ______ so many subjects. [ ]A. to learn B. learning C. learns D. learned …”主要考查了你对  【动名词】  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。