Unless________ to speak, you should remain silent at the meeting.
A．invitedB．inviting
C．being invitedD．having invited
A
考查省略。當(dāng)狀語(yǔ)從句的主語(yǔ)與主句主語(yǔ)一致的時(shí)候，可以把狀語(yǔ)從句的主語(yǔ)和be動(dòng)詞一起省略。本題在unless與invited之間省略了you are.句意：除非別人和你說(shuō)話(huà)，你在會(huì)議上一致要保持沉默。
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