英语名词性从句题See the flags on top of the building?That was______we did this morning.答案是what 能不能填which?为什么?

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英语名词性从句题
See the flags on top of the building?That was______we did this morning.
答案是what 能不能填which?为什么?

what可以引导表语从句,是一个二合一的词就是先行词和关系代词合在一起,等于all that
which不可以.which只做关系代词.如果用which 前面就缺了先行词.