问题
选择题
-----where has his brother been ?
------No one knows. He has returned home safely but his missing made the police _____ .
A．to puzzle
B．puzzling
C．puzzled
D．be puzzled
答案
答案：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。