题目内容
This is _____ and we must _____ on it.
A. hard work; work hard B. a hard work; work hard
C. hard work; hard work D. work hard; hard work
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题目内容
This is _____ and we must _____ on it.
A. hard work; work hard B. a hard work; work hard
C. hard work; hard work D. work hard; hard work