Don’t say anything at the meeting unless——A.to be askedB.being askedC.askingD.asked为什么

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Don’tsayanythingatthemeetingunless——A.tobeaskedB.beingaskedC.askingD.asked为什么Don’tsayanythingattheme

Don’t say anything at the meeting unless——A.to be askedB.being askedC.askingD.asked为什么
Don’t say anything at the meeting unless——
A.to be asked
B.being asked
C.asking
D.asked
为什么

Don’t say anything at the meeting unless——A.to be askedB.being askedC.askingD.asked为什么
D
省略句,被动语态
Don't say anything at the meeting unless (you are) asked.
不要在会议上说话,除非你被要求说话.