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    精英家教网 > 高中英语 > 题目详情
    Unless _________ by the police, you should keep silent over the accident.
    A．asked B．ask C．being askedD．having asked
    A

    试题分析：从by the police可以说明you与ask之间构成被动关系，故排除ＢＤ，另外非谓语动词的省略往往会省略从句的主语和部分谓语，即be动词，故选答案Ａ，也可以将状语从句补全，即Unless you  are asked by the police,然后再去掉you are,即可得知答案。
    点评：状语从句的省略同时具备下列两个条件:①主句和从句的主语一致，或从句主语为it；②从句主要动词是be的某种形式。从句中的主语和be动词常可省略
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