SQL Server 2005 Query, Join, Group By, Return Repeated Rows - sql-server-2005

Question

I have this query in SQL Server 2005:
SELECT ppd.carplanpagoid,
capital,
interes,
ppd.mtocuota,
sinteres,
scapital,
estado,
ppd.objprecolocacionid,
mtopagint,
mtopagcap,
tasaintesperada,
f1.descripcion AS tipocuota,
tasaefectiva,
plazo,
numcuotas,
nombre,
numero,
mtosolicitado,
f2.descripcion AS moneda,
g1.descripcion AS Oficial,
convert(varchar(10), c.fecha, 101)AS FechaPagoCaja,
codigoSec,
f3.descripcion AS monedaCaja1,
CASE
WHEN c.objMoneda =
(SELECT stbcatfinid
FROM stbcatfin
WHERE codint = 'COPF') THEN c.montoMonNac
ELSE c.montoMonExt
END MontoCaja,
0.00 AS SaldoInicial,
0.00 AS SaldoPagado
FROM carcaja c
LEFT JOIN carplanpagodet ppd ON c.objCredito = ppd.objprecolocacionid
LEFT JOIN carplanpago pp ON c.objCredito = pp.objprecolocacionid
LEFT JOIN carprecolocacion pc ON c.objCredito = pc.carprecolocacionid
LEFT JOIN adqclientenew cl ON c.objcliente = cl.adqclienteid
LEFT JOIN stbcatfin f1 ON pp.objtipocuota = f1.stbcatfinid
LEFT JOIN stbcatfin f2 ON pc.objmonedapfid = f2.stbcatfinid
LEFT JOIN stbcatgrl g1 ON pc.objoficial = g1.stbcatgrlid
LEFT JOIN stbcatfin f3 ON c.objmoneda = f3.stbcatfinid
WHERE c.objTipoTransaccion = 5
AND estado = 'P'
AND pc.objtipocliente = 'NAT'
And it returns these rows (I'm not going to put all the columns):
carplanpagoid capital intereses mtocuota
-----------------------------------------------------
9 750.00 225.00 975.00
10 750.00 225.00 975.00
9 750.00 225.00 975.00
10 750.00 225.00 975.00
57 125.00 37.50 162.50
58 125.00 37.50 162.50
59 125.00 37.50 162.50
57 125.00 37.50 162.50
58 125.00 37.50 162.50
59 125.00 37.50 162.50
57 125.00 37.50 162.50
58 125.00 37.50 162.50
59 125.00 37.50 162.50
And here comes my trouble, it return repeated rows (see carplanpagoid), I know I need a group by clause but I don't know where put it.