He has just had a chocolate bar.他刚刚吃了一块巧克力.cho
He has just had a chocolate bar.他刚刚吃了一块巧克力.chocolate是不可数名词没有复数形式也不能在前面加a/an 这句话我在书上看到!按照我的理解是应该 a bar of chocolate 才对!求解为何前面加了a/an 还是书上这句短语是错误格式