There used ______ a sign in front of the cage, and it was used ______ the tourists to stay away from the lions in the z

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1. (2020九上·沅陵竞赛) There used ______ a sign in front of the cage, and it was used ______ the tourists to stay away from the lions in the zoo.

A . to have; to warn B . to have; to warning C . to be; to warn D . to be; to warning

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湖南省怀化市沅陵县2020届初中英语九年级上学期知识竞赛试卷