【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
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:
19%的考友选择了A选项
68%的考友选择了B选项
12%的考友选择了C选项
1%的考友选择了D选项