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【单选题】
设字符串s1='ABCDEFG',s2='PQRST',则运算s=CONCAT(SUB(s1，2，LEN(s2))，SUB(s1，LEN(s2，2))后的串值为(65)。A.
'ABCDEFEF'
B.
'BCDEFG'
C.
'BCPQRST'
D.
'BCQR'
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