It was on October 1st,1949 when he joined the party that he was killed by the enemy soldiers.
题目
It was on October 1st,1949 when he joined the party that he was killed by the enemy soldiers.
为什么用when和that
答案
首先这个一个强调句,基本结构：
It be+强调部分+that/ who .
题目中,强调部分为on October 1st,1949,状语
when引导的定语从句时修饰名词结构 October 1st,1949
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