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Before the school bell    , all the students had entered the classroom.A. went into B. went out C. ...

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when    while    before    after  
before    until    as    since  
when    before    since    after  
before  until  as  since  
where    what    that    if  
usually    already    really    nearly  
We hardly had; before    Hardly had we; when    Hardly had we; than    Hardly did we; when  
Hardly  Scarcely  Rarely  No sooner  
No sooner  Only  Hardly  Rarely  
before  until  as  since  
I hardly had reached    Hardly had I reached   I hardly reached    Hardly did I reach  

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