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    He kept yawning in class this morning. That is _____ he stayed up late doing his homework last night.

    A．why B．how C．because D．whether 

    C

    解析试题分析：句意：今天早晨上课他一直在打哈欠。那是因为他昨晚熬夜到很晚写家庭作业的缘故。通过分析句子结构，可知这个句子中包含一个表语从句，且表示“因为”，这样的意思，所以用because，选C。
    考点：考查表语从句

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