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

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

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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 分词做后置定语修饰“an event”，由于表主动，因此用现在分词，而不用过去分词。因此，A项符合题意。
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