【題目】Unless to speak, you should remain silent at the conference.
A.invited
B.inviting
C.being invited
D.having invited

【答案】A
【解析】考查非謂語動詞。原句意思是,除非你被邀請發(fā)言,否則你應(yīng)該在會議上保持安靜。連詞后可以直接加現(xiàn)在或過去分詞,由主動或被動決定.由于"你"是被邀請的,所以應(yīng)該用過去分詞,所以答案是A。

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