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题型:单选题 题类:常考题 难易度:普通

黑龙江省密山市2018-2019学年七年级下学期(五四学制)英语期末考试试卷

There ________ much rubbish in the river, but now it's very clean and many people like to walk along it.
A、used to be B、used to have C、is used to being
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