( ) 20.________ they finished their homework,they went to bed.A．Before B．Until C．After D．While 为什么不是B

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()20.________theyfinishedtheirhomework,theywenttobed.A．BeforeB．UntilC．AfterD．While为什么不是B()20._______

( ) 20.________ they finished their homework,they went to bed.A．Before B．Until C．After D．While 为什么不是B
( ) 20.________ they finished their homework,they went to bed.
A．Before B．Until C．After D．While 为什么不是B

( ) 20.________ they finished their homework,they went to bed.A．Before B．Until C．After D．While 为什么不是B
其实语法上
before （之前）
after （之后）
都可以.
考题测试的不仅是语法,也是对语境和逻辑的理解,
两者之间选 C 是因为
go to bed
AFTER
doing homework
是比较合理的.

until单独在肯定句使用时的意思是"做某事直至某时"，动词必须是延续性的。但是如题“fnished their现在是个瞬间动作。
否定形式表达的意思是"直至某时才做某事"。动词为延续性或非延续性都可以。
如果要用unitl 是这样使用的， They didn' t go to bed untill they finished their homework.
Until 只...

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