问题补充：
Mrs. White found her husband by letters and papers and very worried.
A. surrounding ; looked
B. surrounded ; looked
C. surrounding; looking
D. surrounded ; looking
答案：
A. surrounding ; looked
B. surrounded ; looked
C. surrounding; looking
(答案→)D. surrounded ; looking
解析：本题考查非谓语动词。句意：怀特夫人发现她的丈夫被信件和文件包围着，看起来非常担心。surrounded by letters and papers和looking very worried都是分词短语作补语，前者表示被动，后者表示主动。
