'You _____(joke),'I replied.'I ____(not know)anyone who does.'
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'You _____(joke),'I replied.'I ____(not know)anyone who does.'
you are joking (==you must be joking)
don't know
are joking ;don't know
...
1.are joking
2.don't know
you're joking
don't know
are joking ;didn't know