MR.Brown must be over forty for he's grown ___.A a few grey hairs B a grey hair C grey hair D a lot of grey hair

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MR.Brown must be over forty for he's grown ___.
A a few grey hairs B a grey hair C grey hair D a lot of grey hair

答案是:A
hair一般情况下是不可数的.特殊的如果是黑发中夹杂一些白发等,这时就要加s
a few grey hairs.一些白头发
布朗先生肯定有四十多了,因为他长了一些白发.