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

题干

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

上一题下一题 0.85难度单项选择更新时间:2010-06-08 10:10:13

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