问题补充：
I sent a big bunch of flowers to the nurse as anof thanks for her taking good care of my grandpa in the nursing home.
A. attitude
B. impression
C. appreciation
D. expression
答案：
A. attitude
B. impression
C. appreciation
(答案→)D. expression
解析：A项attitude n. 态度；看法；意见；姿势。B项impression n. 印象；效果，影响。C项 appreciation n. 欣赏，鉴别；增值；感谢。D项 expression n. 表达，表示；表情。根据句意表达感谢之情故选D
