问题
选择题
Birds singing is sometimes a warning to other birds away.
A．Stay
B．staying
C．stayed
D．to stay
答案
D
题目分析：考查非谓语动词。句意：鸟的歌声有时是让别的鸟远离的警告。To do 做后置定语来修饰a warning,stay away 离开，故选D项。
考点 : 考查非谓语动词
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