She had difficulty _____ up with the rest of the class.
题目
She had difficulty _____ up with the rest of the class.
A.keeping
B.to keep
C.keep
D.kept
答案
B.to keep
have sth to do
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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