题目内容
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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