Many people expressed a strong for<br/>the original plan. A: preference B: signiture C: selective D: employment

请选出英文商务信函的必要组成部分 A: Letter head B: Enclosure C: Date D: Carbon Copy/ C.C. E: Inside address F: Salutation G: Postscript/ P. S. H: Body I: Complimentary close J: Reference No. K: Signiture