【单选题】
The dense Belgian fogs is caused by the cooling of humid surface air to a relatively low temperature.
A.must cause
B.will be caused
C.are caused
D.has been caused
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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
8%的考友选择了B选项
83%的考友选择了C选项
4%的考友选择了D选项