题目内容
17．Abutton （扣子）has come off his coat．分析 一粒扣子从他的外套上掉了下来．
解答 答案：button
此处在句中作主语，根据它前面的不定冠词a以及后面的助动词has使用了第三人称单数形式可知，这里应使用名词的单数形式，故填button
点评 做单词拼写题的关键是：能够根据句意或空缺处在句中的成分，正确地拼写出所填单词的形式；因此需要在平时的学习中应注意词汇量的积累，熟练掌握并正确的运用各种语法知识；本题考查了名词的用法，所以应根据句意确定出名词的单复数形式．
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