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【单选题】

Over a very large number of trials, the probability of an event______is equal to the probability that it will not occur.
A．occurring

B．to occur
C．occurs
D．occur
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根据网考网移动考试中心的统计，该试题：

52%的考友选择了A选项

6%的考友选择了B选项

3%的考友选择了C选项

39%的考友选择了D选项

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