【題目】An accident happened on the main road. That is ______ traffic seemed to slow suddenly.

A. why B. how C. when D. what

【答案】A

【解析】考查表語從句。句意：在主路上發(fā)生了一場事故。那就是交通為什么突然慢了下來。此處用why引導(dǎo)的表語從句，表示“為什么”，故答案為A。

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