题目内容
3.The school rule states that no child shall be,unless _______ by an adult,allowed out of the school during the day.( )A. | was accompanied | B. | accompanied | ||
C. | accompanying | D. | being accompanied |
分析 校规规定如果没有大人陪同,不允许孩子白天出校园.
解答 答案:B
题干中unless _______ by an adult是一个省略的条件状语从句,省略了相同的主语child和系动词;accompany与child之间构成动宾关系,要用被动. 故选B.
点评 过去分词是非谓语动词的一种,用法很灵活,分为简单式done(表示与谓语同时或几乎同时发生的动作);完成式having been done(表示先于谓语的动作).学习时,要把握其用法特征:表示被动和完成.同时还要注意区分现在分词和不定式.

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