He must have been working really hard th
题型:选择题
问题:
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
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