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--I don't think we have met before.

--Yes, once at a party, but we___________.

A. weren't introduced             B. didn't introduce

C. haven't introduced             D. were not introducing  

--I don't think we have met before.  --Yes, once at a party, but we___________.

A. weren't introduced             B. didn't introduce

C. haven't introduced             D. were not introducing

--I don't think we have met before.

--Yes, once at a party, but we___________.

A. weren't introduced             B. didn't introduce

C. haven't introduced             D. were not introducing  

--I don't think we have met before.

--Yes, once at a party, but we___________.

A. weren't introduced             B. didn't introduce

C. haven't introduced             D. were not introducing

--I don't think we have met before.

--Yes, once at a party, but we___________.

A. weren't introduced　　　　　　 B. didn't introduce

C. haven't introduced　　　　　　 D. were not introducing