请问this is one of the problems that badly ______A needs solving B need solving C needs to be solving D need to solve 为什么选择答案B啊

This is one of the ____watches.(run) This is one of the _______watch(run) this one really is out of the This dress is one of the ( visit ) life is difficult,this is one of the greatest---(ture) 10.This is the only one of the books published Of all the shops,this one is the _____(bad) This bridge is three times the length of that one.. This is one of the most famous( )in China.(church) This is the ____(one)page of my English diary. this is one of the most famous---------(hero) names this is one of the ways to show my This is the ____(one)day of school This is one of the reasons why .这是什么从句 This is one aspect of This being the case,如句子：This being the case,china is one of developping countries. This Is The One 歌词 This is one of the best novels that (have appeared) this year 为什么用have,one of不是...This is one of the best novels that (have appeared) this year为什么用have,one of不是单数吗?