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    精英家教网 > 高中英语 > 题目详情
    14．It's a demand that when having a class one always concentrate on teachers．

    分析 要求上课时一个人总是要将注意力集中到老师身上．

    解答 答案：concentrate 考查首字母填空．根据句意和句子结构，要填入动词，concentrate on意为""，在demand的主语从句中，要用虚拟语气，谓语动词用should+动词原形，should可省略．

    点评 考查首字母填空，准确地理解句子、翻译句子，然后根据句意及提示写出单词，完成句子，使句意更通顺．

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