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    精英家教网 > 高中英语 > 题目详情
    Unless ____ to speak,  you should remain silent at the conference.
    A invited        B inviting          C being invited   D having invited
    A
    本题考查动词的-ed形式。You 与invite 之间构成被动关系，故用过去分词。Unless invited to speak =" Unless" you are invited to speak. 答案为A。
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