Unless to speak.you should remain silent at the conference．( )A．invitedB．invitingC．being invitedD．having invited 题目和参考答案——青夏教育精英家教网—

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

A．

invited

B．

inviting

C．

being invited

D．

having invited

分析除非被邀请讲话，否则你在会上应该保持沉默．

解答答案：A．从句主语为you和从句中谓语动词invite之间为被动关系，故使用过去分词invited，完整形式为Unless you are invited，故选A．

点评本题考查过去分词的用法．应根据从句中主语和谓语动词之间的关系来选择合适的过去分词．

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