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：

“在会议上你应该保持沉默，除非被邀请讲话。”主句主语与invite具有被动关系，故此处应使用表示被动关系的过去分词invited．unless invited to speak相当于unless you are invited to speak．

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