There are considerable archaeological difficulties about the theory that theycame from England.
是定语从句吗?
There are considerable archaeological difficulties about the theory that they came from England.
如果是定语从句的话,that 在从句中做什么成分?
明明是 theory 的同位语从句 —— 完整的句子成分。说明 theory 的具体内容。
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