题目内容

-----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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