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、occurred
C、occurs
D、occur

答案 A

解析分词作定语修饰event，由于表主动，所以用现在分词。

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[originaltext]Weallknowwhatasignificantnumberofobstaclesthetouris