2. 外语
  3. What is the probability of this event______?

What is the probability of this event______?

admin2012-05-04  17
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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