When a group of initials begins with a,e,f,h,i,l,m,n,o,r,s,or x, each having a vowel sound,
the indefinite article "an" is used.----A Manual of Style by U.S. Government Printing Office
 
回複:What do you think it should be?
所有跟帖:
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                    Good to know. Thx.
                     -ZoyaWashington- 
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                        02/08/2014 postreply
                                                10:19:56