appearance可数？
一位容姿高雅的男士。~The appearances of social networks have changed our culture in many ways。~The president candidates made several appearances on TV。Their exp...
a plenty of
A没有这个表达！A只有PLENTY OF 注意了 这个经常在改错中出现。a plenty of、a large deal of和a good supply of 在多数情况下修饰不可数名词，如：a plenty of water, a geat deal of time，不过它们也可以修饰可数名词，...