He worked so hard that he kept up ( )the classa about b toc withd for

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He worked so hard that he kept up ( )the classa about b toc withd for
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He worked so hard that he kept up ( )the classa about b toc withd for
He worked so hard that he kept up ( )the class
a about
b to
c with
d for

He worked so hard that he kept up ( )the classa about b toc withd for
c with
keep up with
1.跟上,不落在…后面:例句:Hurry up,or you won't keep up with them.
快点,否则你就赶不上他们了.Jane could't keep up with the rest of the class.
简跟不上班里的其他同学.2.赶上(某思想、风尚等):例句:Young girls like to keep up with the latest fashions.
年轻女孩喜欢赶最新潮流.3.保持联系,和…来往:例句:She still kept up with her classmates after graduation.
毕业后她仍然与她的同学保持联系.
以上来源于:《21世纪大英汉词典》

C with
keep up with 赶上,跟上

C
keep up with 固定用法,表示追上。。。

C