--Could I speak to Mr Brown?
-- , I'1l go and see if he is in.
A. Who are you
B. He isn't here
C. I'm sorry
D. Hold on, please
网友回答
A. Who are you
B. He isn't here
C. I'm sorry
(答案→)D. Hold on, please
解析：：考查交际用语。A你是谁？B他不在这里；C对不起；D请稍等。我去看看他在不在？句意：—我找Mr Brown。—请稍等。我去看看他在不在。根据句意说明D正确。