He is only thirty, but has got .
A. a few grey hairs
B. a few grey hair
C. a little grey hair
D. a little grey hairs
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(答案→)A. a few grey hairs
B. a few grey hair
C. a little grey hair
D. a little grey hairs
解析：句意，他只有三十岁，但却有几根白头发了。Hair作“头发，毛发”时为不可数名词，如作“几根头发”时则为可数名词，故选A。