Unless to speak, you should remain silent at the conference． A．invited B．inviting C．being invited D．having invited 题目和参考答案——青夏教育精英家教网—

题目内容

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

A．invited

B．inviting

C．being invited

D．having invited

答案：A
提示：

除非被邀请，完整的句子是unless you are invited to speak, 因此句主语you和后面主句的主语一致，故可以省略，因为原句为被动态，所以应该用过去分词

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