Four years had passed, and I found Mary had＿＿＿＿＿．
A. little white hair
B. some white hair
C. much white hairs
D. a few white hairs
网友回答
A. little white hair
B. some white hair
C. much white hairs
(答案→)D. a few white hairs
解析：hair 指满头“头发”，为不可数名词；指具体的某种“头发”或一根一根的“头发”，为可数名词。