题目内容
13．Millie won't go to Jack's birthday party unless sheis invited （invite）．分析 如果Millie 没有受到邀请，她不会去Jack的家．
解答 答案：is invited
分析句子结构可知该句为含有unless"除非．如果不…"引导的条件状语从句的复合句，主句是一般将来时态，根据主将从现原则可确定从句的时态为一般现在时态，根据从句的主语she是谓语动词invite的承受者二者形成被动关系故确定为被动语态，故从句的谓语动词为一般现在时的被动语态，其结构为：is/am/are+过去分词，故答案为is invited
点评 本题考查用所给单词的适当形式填空，首先要根据语境明确句意，然后再根据相关语法对所给单词在形式上做出正确的变化
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