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【单选题】

Cement is produced (commercially) by (to heat) a mixture of limestone and clay (in a) large,(slowly rotating) cylindrical furnace.
A．commercially

B．to heat
C．in a
D．slowly rotating
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根据网考网移动考试中心的统计，该试题：

7%的考友选择了A选项

83%的考友选择了B选项

3%的考友选择了C选项

7%的考友选择了D选项

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