定语从句这里填什么We have referred your claim to our lawyer,___we are sure will reply before long？

Question

We have referred your claim to our lawyer,___we are sure will reply before long.
上面那句话的our lawer放到从句应该是we are sure (that) our lawer will reply before long.所以在从句中做主句的宾语，从句的主语，应该用whom还是who？

Answer 1

么We have referred your claim to our lawyer,___we are sure will reply before long？
填 who，因为前面有逗号。追问

前面有逗号是怎么直接得出填who的结论的？？？
是直接看它作最内层从句的句子的成分吗？

Answer 2

填who，在从句中作主语。
We have referred your claim to our lawyer, who，we are sure ，will reply before long.
我认为we are sure 前后应该有逗号，作为插入语。
整句话的意思是：
我们已将您的要求转交给了我们的律师，我们相信，他很快就会答复。
who will reply before long. who在句子里作主语。

Answer 3

whom 是 who 的宾格，who 作主语用，whom 作宾语用。
从句中要修饰的“lawyer”，做的是主语成分，“不久后肯定会回复你的 律师 ”本回答被提问者采纳

Answer 4

we have referred your claim to our lawyer who we're sure will reply before long. 

In this sentence, the subject of subordinate sentence should be "who"