题目内容
Visitors to the hills are greeted by signs them to look out.
| A.warn | B.to warn | C.warning | D.warned |
C
试题分析:考查非谓语动词。句意 去山上游玩的游客看到一块牌子,警告他们小心。原句应是Visitors to the hills are greeted by signs which warns them to look out,sign后面跟着一个定语从句,也可换成后置定语,因为是主谓关系,用doing形式,所以选C项。
考点 : 考查非谓语动词
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