问题描述：
To our joy,________________-
To our joy,________________
1.two-fifth of the work has been finished
2.two-fifths of the work have been finished
3.two-fifth of the work have been finished
4.two-fifths of the work has been finished
To our joy,________________
1.two-fifth of the work has been finished
2.two-fifths of the work have been finished
3.two-fifth of the work have been finished
4.two-fifths of the work has been finished
问题解答：
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