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    精英家教网 > 高中英语 > 题目详情

    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

     

    【答案】

    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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         Observations of the Small Copper Butterfly, a colourful orange and black butterfly, showed that some
    females closed their wings when males flew by, but only when they were males of their own species, said
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