单项选择题

 _______ of us is perfect; we all may make mistakes. 
Both   B.None    C.Neither  D.All 

A.
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单项选择题
-- Has Mary finished writing her article?-- No, and it _____ before class was over.A.should be finished B.should finish C.should have finished D.ought to have been finished
A.A.
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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