I think they failed to accomplish the task, ______?
#65406
A
do I
B
don't I
C
did they
D
didn't they
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What the young man said sounds strange，_______it is true.
#65401
A
but and
B
yet and
C
and but
D
and yet
—I don't think we have met before，________？—Yes，once at a party，but we weren't introduced.
#64458
A
do I
B
have we
C
don't I
D
haven't you