This is _____ and we must _____ on it.A．hard work; work hardB．a hard work; work

题干

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

上一题下一题 0.85难度单选题更新时间:2014-03-27 05:06:41

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