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Old 01-31-2005, 03:15 AM   #9 (permalink)
vvaann
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Re: Questions from 1996-05 Structure section

Hi all,

Can we use:
The discovery of the antibiotic penicillin in 1928 had not produced ...

instead of:
The discovery of the antibiotic penicillin in 1928 did not produced ...

??

Br,
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