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题型:单选题 题类:常考题 难易度:普通

天津市六校(静海一中、宝坻一中、杨村一中等)2018-2019学年高一上学期英语期末考试试卷

People can unlock the shared bikes, _________are equipped with GPS and can be left anywhere in public, by simply _________their smart phones.
A、which; use B、which; using C、of which; use D、of which; using
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