问题标题:
Thisisthehappiestthing_____hashappenedinmylifewhichwhowhatthat顺便告诉我遇到这种题目应该怎么选,
问题描述:

Thisisthehappiestthing_____hashappenedinmylife

whichwhowhatthat

顺便告诉我遇到这种题目应该怎么选,

华沙宝回答:
  that,定语从句做主语用that或WHICH修饰名词,但由于前面是最高级,只能填THAT
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