设串 S1=‘ABCDEFG’,S2=‘PQRST’, 函数 CONCAT ( X , Y )返回 X 和 Y 串的连接串, SUBSTR ( S , I , J )返回串 S 从序号 I 开始的 J 个字符组成的字串, LENGTH ( S )返回串 S 的长度,则 CONCAT ( SUBSTR ( S1 , 2 , LENGTH ( S2 )), SUBSTR ( S1 , LENGTH ( S2 ), 2 ))的结果串是( )
A.
BCDEF
B.
BCDEFG
C.
BCPQRST
D.
BCDEFEF
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