a letter of congratulation/congratulations

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joham

Key Member
Joined
Oct 30, 2007
Member Type
Student or Learner
Native Language
Chinese
Home Country
China
Current Location
China
I wrote him a letter of congratulation/congratulations.
Are both singular and plural OK? Can we also use the plural form?

Thank you in advance.
 

meela

Member
Joined
Aug 7, 2010
Member Type
Student or Learner
Native Language
Urdu
Home Country
Pakistan
Current Location
Pakistan
always write congratulations
 
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