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问题详情:

 Visitorstothehillsaregreetedbysigns       themtolookou...

 Visitors to the hills are greeted by signs        them to look out.

   A. warn                  B. to warn                   C. warning                   D. warned

【回答】

C

知识点:非谓语动词

题型:选择题

TAG标签:#themtolookou #