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

A.invitedB.invitingC.being invitedD.having invited

A

解析試題分析:原句意思是,除非你被邀請(qǐng)發(fā)言,否則你應(yīng)該在會(huì)議上保持安靜。連詞后可以直接加現(xiàn)在或過(guò)去分詞,由主動(dòng)被動(dòng)決定.由于"你"是被邀請(qǐng)的,所以應(yīng)該用過(guò)去分詞,故選A。
考點(diǎn):本題重點(diǎn)考查非謂語(yǔ)動(dòng)詞及省略用法。
點(diǎn)評(píng):連詞后可以直接加現(xiàn)在或過(guò)去分詞,由主動(dòng)被動(dòng)決定.由于"你"是被邀請(qǐng)的,所以應(yīng)該用過(guò)去分詞。

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