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They didn't stop working_______ they were very tired.答案是though,为啥不选until

题目详情
They didn't stop working_______ they were very tired.答案是though,为啥不选until
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答案和解析
not until 直到.才
这种巨型中,until后应跟非延续性的动词.而were very tired表示一种状态,是延续性的.