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1.______it is a holiday today,they needn't go to work.

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1.______it is a holiday today,they needn't go to work.
A.AS B.When C.For D.As long as
答案是A为什么?
2.They were just about to leave ________ the baby cried.
A.before B.when C.while D.as
答案是B为什么?
1.______it is a holiday today,they needn't go to work.
as 表原因,可以放句首,连接时间状语从句
FOR表原因,是补充性的,不放句首,在句子中间
BD都不表原因
ABOUT TO DO ...when
这是 固定短语
记住就行了
想要做某事,突然..