people didn't know what_____(happen)during the night
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people didn't know what_____(happen)during the night
根据句子里的didn't 可以得知这是已经发生的事了,所以用happen的过去式happened,这句话也是考察what happened的用法,这个短语多数是用在对方问另一方发生什么事的时候用
happened 填过去时 didn't
填will happen,表示将来时态