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问题: where was it ____ the accident heppend yesterday?

--where was it ____ the accident heppend yesterday?
--in front of the super market.
为什么填that?

解答:

次 句是强调句型!!你只需要将其还原成陈述句就可以了
还原如下:It is where that the accident happend yesterday.
句中对地点进行强调。去掉强调的部分,既It is that仍是一个完整的句子
就应该是where did the accident happen yesterday?