When I got out of the car and walked about among them, ______ one old man who shook his head disapprovingly, they all began to cheer.

【正确答案】 D

【答案解析】 词组辨析。except for意为“除……以外”，后接名词，符合句意。故答案为D。see that“留意；负责；务必”，except that“除去……之外”；provided that“如果，在……条件下”，这三项后面都要接句子。