They have made much progress_____ their hard workA.through B.in C.with D.by

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They have made much progress_____ their hard workA.through B.in C.with D.by

They have made much progress_____ their hard workA.through B.in C.with D.by
They have made much progress_____ their hard work
A.through B.in C.with D.by

They have made much progress_____ their hard workA.through B.in C.with D.by
第一时间为你提供正确答案:
A
through hard work 通过努力工作

b

through A
一般by后面用ing形式,主要强调动作。