问题描述：
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?
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?
问题解答：
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