people didn't know what_____(happen)during the night
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![people didn't know what_____(happen)during the night](/uploads/image/z/10619526-30-6.jpg?t=people+didn%27t+know+what_____%28happen%EF%BC%89during+the+night)
people didn't know what_____(happen)during the night
people didn't know what_____(happen)during the night
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