They sang happily until it got dark.=They didn't ------------until it got dark.

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They sang happily until it got dark.=They didn't ------------until it got dark.

They sang happily until it got dark.=They didn't ------------until it got dark.
They sang happily until it got dark.=They didn't ------------until it got dark.

They sang happily until it got dark.=They didn't ------------until it got dark.
我来给你细细解释这个句子
They sang happily until it got dark.
untill的前半句多用否定句,当用肯定句时,像这句
他们唱的很开心,偏偏天黑了.
天黑前,他们一直很开心的唱,天黑坏了他们的好事.
注意这里不能用till代替until,意思不一样的.
用作否定句时:not...untill...直到...才
They didn't stop singing happily until it got dark.
知道天黑,他们都不停的唱着.

They sang happily until it got dark.=They didn't stop singing until it got dark.

They sang happily until it got dark.
=They didn't [stop singing happily] until it got dark.