He must have been working really hard these days. This morning, I even noticed behind his

发布时间：2020-08-16 11:14:45


He must have been working really hard these days. This morning, I even noticed      behind his ears.
A. grey hair
B. grey hairs
C. the grey hair
D. much grey hair

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A. grey hair
(答案→)B. grey hairs
C. the grey hair
D. much grey hair
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