What is the probability of this event______?A、to occurB、occursC、occurringD、oc

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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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