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下面这句话time后面应该有"when"吗?archaeologyisthestudyofacivilizationbylookingatthingsthatremainsformthetime()thecivilizationexisted.空格内可以不填吗?

题目详情
下面这句话time 后面应该有"when"吗?
archaeology is the study of a civilization by looking at things that remains form the time ()the civilization existed.空格内可以不填吗?
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答案和解析
应该是...that remains from the time 吧.
from the time when the civilization existed.when 不能少.