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when与untilWehadbeendrivingforhoursIrealizedthatsomethingwaswrongwithoneofthetyres.填when还是until呢?

题目详情
when与until
We had been driving for hours _________I realized that something was wrong with one of the tyres.
填when还是until呢?
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答案和解析
when

when 引导从句,后面是个完整的句子.
until 一般用于否定句.