题目

Our home river, Yitong River used to __________ seriously, but now it's as clear as a mirror.A.pollute B.polluting C.is polluted D.be polluted 答案：【答案】D【解析】句意：我们的家乡河流，伊通河曾经污染严重，但现在它像镜子一样清澈。动词固定搭配。pollute污染，动词原形；polluting动名词；is polluted ；D. be polluted被动语态。根据but now it's as clear as a mirror. 但现在它像镜子一样清澈。结合Yitong River used to ___ seriously,可知是伊通河过去被污染严重将小数10.080化简后是（　　）A．10.8B．1.08C．10.08