题目内容

【题目】Nobody knows ______ yesterday.

A. how the accident happened

B. how does the accident happen

C. how the accident happens

D. how did the accident happen

【答案】A

【解析】

句意：没有人知道昨天事故是如何发生的。根据yesterday可知此处用一般过去时，故排除BC两项。作为动词knows的宾语从句，故用陈述语序：疑问词+主语+谓语+宾语，故选A。

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