题目内容
17．Is these your sisters？A．is改为areA B C．
分析 这些是你的姐妹们吗？
解答 答案：A．is改为are．考查系动词．句意"这些是你的姐妹们吗？"．these这些，应该用系动词复数are，is是单数，不正确，答案是A．is改为are．
点评 改错题，在充分理解题意基础上，综合运用所学语言知识，根据不同的错误情况分别进行答题（即改词、加词或减词）等．改完后再验证下答案．
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