When ________ happens, we usually remember it well.

[　　]

A.dramatic something
B.something dramatic
C.anything dramatic
D.dramatic anything
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科目：初中英語 來源：同步題 題型：單選題

We don't know when the accident ______.          
[     ]
A. has happened        
B. happened      
C. happening          
D. to happe

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