单选题
2分
The reason why she didn't show up at the party is ______ she got stuck in a traffic jam.
参考答案: A
参考解析:
本题主要考查表语从句连接词的用法。
题干意为：她没有在聚会上露面的原因是她遇上了交通堵塞。首先分析句子结构，整句话的谓语动词由is充当，构成主系表结构。
The reason why she didn't show up at the party是主语，其中why引导了定语从句修饰the reason，去掉从句部分，主语为the reason，所以符合表语从句常见结构：The reason is that，that后引导表语从句。故选D项。
A项，as不能引导表语从句。
B项，The reason is because...为错误表述，句式杂糅。正确表述是The reason is that...或That is because...。
C项，that不能引导表语从句。
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