题目内容
20．How manyclasses （classes，class） are there at your school？分析 你们学校有多少班？
解答 答案：classes
联系语境，根据关键词how many结合are there可知其后应该跟可数名词的复数，how many提问数量，结合提示词class为可数名词，所以此处应该用复数形式classes，此句是问"你们学校有多少班？"符合句意及用法．故填：classes
点评 此题考查名词的单复数的用法．答题时注意关键词how many从而确定出名词的复数形式．
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