Many English _____ were opposed to the American Revolution of 1776 moved to Canada,where thMany English _____ were opposed to the American Revolution of 1776 moved to Canada,where they were known as United Empire Loyalists.(A) settling there(B) they settled(C) who were settlers(D) settlers who选d 主语不重复吗?

答案是D.Many English settlers是定语从句所修饰的先行词， who是关系代词，有两个作用：一是起到连接作用，一是在定语从句中充当成分。who were opposed to the American Revolution of 1776 是定语从句。

主语不重复。这个句子只有一个主语Manmy English settlers ，而 who 引导的句子who were opposed to the American Revolution of 1776做定语修饰主语，where they were known as United Empire Loyalists则做Canada这个宾语的补足语

不重复,分开看,many English settlers/who were.许多英国殖民者/他们...这个句子是定语从句,‘/’前面是主语,‘/’后面的‘ who were opposed to the American Revolution of 1776 moved to Canada,where they were ...

who 在这里是关系代词，引导many english settlers的定语从句。
关系代词所代替的先行词是人或物的名词或代词，并在从句中充当主语、宾语、定语等成分。关系代词在定语从句中作主语时，从句谓语动词的人称和数要和先行词保持一致。
who, whom, that
这些词代替的先行词是人的名词或代词，who做主语指人，whom作宾语指人，that既可作主语又可作宾语（作宾语可以省略），可以指人也可以指物。在从句中所起作用如下：
(1) Is he the man who/that wants to see you? 他就是想见你的人吗？（who/that在从句中作主语）
(2) He is the man whom/ that I saw yesterday. 他就是我昨天见的那个人。（whom/that在从句中作宾语）