Unless ____ to speak,  you should remain silent at the conference.
A invited        B inviting          C being invited   D having invited
A
本題考查動詞的-ed形式。You 與invite 之間構(gòu)成被動關(guān)系，故用過去分詞。Unless invited to speak =" Unless" you are invited to speak. 答案為A。
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