Birds'singing is sometimes a warning to other birdsaway.A. stayingB. stayedC. stay D. to s

发布时间：2020-08-17 02:43:19

Birds'singing is sometimes a warning to other birds    away.
A. staying
B. stayed
C. stay
D. to stay

网友回答

A. staying
B. stayed
C. stay
(答案→)D. to stay
解析：句意：鸟的叫声有时是警告其他的鸟要离开。因为该句已经有系动词，故不缺少谓语动词，排除C；warning是抽象名词，它的后面常用不定式作定语，故选D。
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