In this park , sparrows often fly down from trees to eat from visitors’hands. They are used to in this wayA.be fedB.feedC.having fedD.being fed
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D解析考查非谓语动词。句意：在这个公园，麻雀经常从树上飞下来从游客手上吃东西。他们习惯了被这样喂食。Be used to 习惯于某事，后面接名词或者动名词。麻雀是被喂食的对象，故用被动语态的动名词。选D。