Thecoalminersworkinthree___everyday,thatis,threegioupsofworkersworkeighthour选项：a.linesb.shiftsc.sheetsd.shsdes
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题目内容：
The coal miners work in three ___every day ,that is ,three gioups of workers work eight hour
选项：
a.lines b.shifts c.sheets d.shsdes
优质解答
b
矿工分三班工作
shifts 轮班
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