The windows were never opened( )to air the room for a few minutes in the morning.
A.正确答案Aexcept
B.but
C.as
D.unless
The windows were never opened( )to air the room for a few minutes in the morning.
The windows were never opened( )to air the room for a few minutes in the morning.
A.正确答案Aexcept
B.but
C.as
D.unless