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-----where has his brother been ?
------No one knows. He has returned home safely but his missing made the police _____ .
A.to puzzleB.puzzlingC.puzzledD.be puzzled
C
考查非谓语动词做宾语补足语。Puzzled感到困惑的;修饰表示人的名词。Puzzling令人困惑的,修饰表示事物的名词;句意:他已经安全到家里但是他的失踪让警方很困惑。
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