单项选择题

Only after the second tower of the World Trade Centre did people know it was not an accident, but an attack of some kinD.
  A.had hit B.did fall   C.was hit  D.was fallen 

A. 
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__ , she knew she'd never been there beforE.
A.   
单项选择题
We were just about to leave_______ it started to snow.A.when B.before C.after D.since
A.A.
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