We had hardly got into the country ______ it began to rain.答案(A)
A. when
B. before
C. than
D. after
1. 比较while, when, as
1)as, when 引导短暂性动作的动词。
Just as / Just when / When I stopped my car, a man came up to me.
2)当从句的动作发生于主句动作之前,只能用when 引导这个从句,不可用as 或 while。
When you have finished your work, you may have a rest.
3)从句表示"随时间推移"连词能用as,不用when 或while。
As the day went on, the weather got worse. 日子一天天过去,天气越变越坏。
2. 表示"一…就…"的结构,
hardly/scarcely…when /before, no sooner…than 和as soon as都可以表示"一…就…"的意思,
例:I had hardly / scarcely got home when it began to rain.
I had no sooner got home than it began to rain.
As soon as I got home, it began to rain.
注意:如果hardly, scarcely 或no sooner置于句首,句子必须用倒装结构:
Hardly / Scarcely had I got home when it began to rain.
No sooner had I got home than it began to rain
3. 比较until和till
此两个连词意义相同。肯定形式表示的意思是"做某事直至某时",动词必须是延续性的。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。 正确使用这两个连词的关键之一就在于判断句中的动词该用肯定式还是否定式。
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