题目内容：

Miss Green says it is one of the most useful_____(dictionary)
These watches and clocks are made in some ____(factory)in this city.

优质解答

1 dictionaries
分析 one of the 最高级+名词复数‘ ……最……之一’
2 factories ( some 后接可数名词的复数）
加油!不明白再问!