What is the probability of this event______?

admin2012-05-04 23

问题 What is the probability of this event______?

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

答案C

解析非谓语动词题。这里是现在分词作为定语修饰event，相当于occurring前省略掉which is。

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专业英语四级

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