Birds' singing is sometimes a warning to other birds ______ away.
A．to stayB．stayingC．stayedD．stayed
A
考察非謂語動詞。本題考查非謂語動詞做目的狀語的情況，空格置于句中，主謂與to do之間無逗號間隔，譯為“為了”。句意：鳥叫有時是為了警告其他的鳥遠離他們。
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