题目内容

Nobody knows ______ yesterday.
A．how the accident happens
B．how does the accident happen
C．how the accident happened
D．how did the accident happen
C

试题分析：句意：没有人知道昨天的事故是怎么发生的，宾语从句的结构：主语+谓语+连接词+从句。从句在句中作宾语。从句要用陈述句的语序。如果主句是一般现在时，从句根据需要选择时态，如果主句是过去时态，从句要用相应的过去时态。但是从句是客观真理，一般用一般现在时态。根据时间状语yesterday.故用过去时态，BD语序错误，故选C。
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