someone knocked( )the door while i( )my housework
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someone knocked( )the door while i( )my housework
a.at,were doing
b.at,was doing
c.on,was doing
d.on,were doing
a.at,were doing
b.at,was doing
c.on,was doing
d.on,were doing
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someone knocked( )the door while i( )my housework
I was cleaning my bedroom while someone knocked on the door改
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Someone knocked on my door just now.But he left ------ I cou
时态变化I was reading when someone knocked at the door.在该句前加I sa
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