It seems that man was making a real effort to understand the seasons 20,000 years earlier than has been supposed.、、
问题描述：
It seems that man was making a real effort to understand the seasons 20,000 years earlier than has been supposed.、、
that是什么从句 to understand the seasons 20,000 years earlier 是不定式作定吗
答
It主语seems系动词that从句是表语从句it是人称代词,没有什么实际意思.it seems that译成“（情况）看来……”比如：It seems that he will come tonight.可改成：He seems to come tonight.不定式是做目的状语,相当...