Tom hid himself behind the door, _________ he could hear the steps of his mother clearly.
#75879
A
from which
B
from where
C
where
D
which
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Is this factory _____ your sister used to work?
#77972
A
that
B
the one which
C
where
D
the one where
The boy asked his mother _______ go out to relax himself or not.
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A
whether could he
B
if he could
C
that he could
D
whether he could