题目内容
18．All the students aresitting （坐）in the classroom and having a music class now．分析 现在，所有的学生坐在教室里上音乐课．
解答 答案：sitting．
根据提示汉语结合语境推测句意是"现在，所有的学生坐在教室里上音乐课．"，根据now判断用现在进行时，构成是：am/is/are+动词的现在分词，"坐"的英文是sit，所以答案是：sitting
点评 做这类题型，首先根据所给汉语明确句子所要考查的单词或短语的拼写，再结合相关语法知识对单词或短语做出形式上的变化．
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