-----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
考查非謂語動詞做賓語補足語。Puzzled感到困惑的；修飾表示人的名詞。Puzzling令人困惑的，修飾表示事物的名詞；句意：他已經(jīng)安全到家里但是他的失蹤讓警方很困惑。
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