Over a very large number of trials, the probability of an event ______ is equal

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问题 Over a very large number of trials, the probability of an event ______ is equal to the probability that it will not occur.

选项 A、occurring
B、to occur
C、occurs
D、occur

答案 A

解析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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