B. from polluting
C. polluting
D. being polluted D 句意:作为市民,我们应该尽力防止我们的河流被污染。A中from后要加being才对。“河流被污染”表被动,故选D。 1、When I walked around the city, I saw streets just as they had been, with stepping stones along the road so you did not have to step in the mud on rainy days! 当我在城中漫步时,我看到保持着原样的街道,沿路都有垫脚石,这样下雨天你就不用在泥泞中行走! 本句为并列复合句,以so为分界点,I saw streets…和you did not have to…为两个平行的句子,when引导时间状语从句,just as从句和with复合结构均为streets的后置定语。 2、By the age of thirty, he had already occupied more than land than anyone before… 到30岁时,他已经占领比以前任何人更多的土地…… 句子中有by +过去时间的时间状语以及by the time +过去时的时间状语从句,谓语动词使用过去完成时。 ◆By the time he was fourteen, Einstein had
learned advanced mathematics all by himself.
到爱因斯坦14岁时,他已经自学了高等数学。 C 句意:当我与奶奶在电话中交谈时,她的声音听起来很虚弱,但到我们挂断电话时,她的声音已经充满了活力。考查动词时态。据题干her voice had been full of life为过去的过去,因此我们挂断电话为过去的动作。by the time +一般过去时的从句,主句用过去完成时,表示“到……时候为止,已经……”。 When I talked with my grandma on the phone, she sounded weak, but by the time we ______ up, her voice had been full of life.
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