【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
网考网参考答案：A
网考网解析：
语法题。这里是现在分词作为定语修饰event，相当于occurring前省掉which is。
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