my neighbors used to give me help ___was always in time用that行吗?为什么

my neighbors used to give me help ___was always in time
用that行吗?为什么

你好,可以
这个时候你的句子是定语从句,先行词是help,用which 或that都可以,在从句中做的是主语
分解句子：my neighbors used to give me help
The help was always in time
不懂可以追问