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【单选题】

The (principal) reason for the great (number of) smoke is (that) there are (too many) factories in this area.
A．principal

B．number of
C．that
D．too many
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根据网考网移动考试中心的统计，该试题：

5%的考友选择了A选项

88%的考友选择了B选项

6%的考友选择了C选项

1%的考友选择了D选项

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