高手来找错，高分！！

现有如下SQL语句：
SELECT A.PDT_ID,A.PDT_NAME,B.quan AS 数量, B.pri AS 单价, B.cn AS 金额,C.quan as 数量1,C.pri as 单价1,C.cn as 金额1
FROM PDT_TABLE AS A
LEFT JOIN
(
SELECT PDT_ID, sum(quantity) AS quan, sum(cnt)/sum(quantity) AS pri, sum(cnt) AS cn
FROM XSFP_TABLE GROUP BY pdt_id
)
AS B
ON A.pdt_id=B.pdt_id
LEFT JOIN
(
SELECT PDT_ID, sum(quantity) AS quan, sum(cnt)/sum(quantity) AS pri, sum(cnt) AS cn
FROM XSFP_TABLE
WHERE crea_date>#10/1/2002# And crea_date<#10/31/2002#
GROUP BY pdt_id
)
AS C
ON A.pdt_id = C.pdt_id
提示的错误是：
A.pdt_id=B.pdt_id
LEFT JOIN
(
SELECT PDT_ID, sum(quantity) AS quan, sum(cnt)/sum(quantity) AS pri, sum(cnt) AS cn
FROM XSFP_TABLE
WHERE crea_date>#10/1/2002# And crea_date<#10/31/2002#
GROUP BY pdt_id
)
AS C
ON A.pdt_id = C.pdt_id
这部分“操作符丢失”，偶百思不得其解，希望各位达人指点迷津
PS：
1。偶用的是ACCESS
2。把最后一句改成ON B.pdt_id = C.pdt_id也不行，提示还是“操作符丢失”