There are a lot of _______（difficulty ）that have to be overcome.横线内应该用什么形式的单词?急

There are a lot of _______（difficulty ）that have to be overcome.横线内应该用什么形式的单词?急
There are a lot of _______（difficulty ）that have to be overcome.横线内应该用什么形式的单词?急

There are a lot of _______（difficulty ）that have to be overcome.横线内应该用什么形式的单词?急
difficulties 复数形式

difficult， 困难名词。

变y为i加es

difficulties 作名词是复数

difficulties
定语从句中用的复数动词“have”，所以先行词difficulty应该用复数形式