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Birds' singing is sometimes a warning to other birds ______ away.
A.to stayB.stayingC.stayedD.stayed
A
考察非谓语动词。本题考查非谓语动词做目的状语的情况,空格置于句中,主谓与to do之间无逗号间隔,译为“为了”。句意:鸟叫有时是为了警告其他的鸟远离他们。
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