Unless to speak, you should remain silent at the conference. A. invited B. invite ——青夏教育精英家教网—

摘要： Unless to speak, you should remain silent at the conference. A. invited B. invite C. being invited D. having invited

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Unless _____ to speak, you should remain silent at the conference.

A．invited B．invite C．being invited D．having invited

Unless ________ to speak, you should remain silent at the conference．

A．invited

B．invite

C．being invited

D．having invited

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