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【单选题】
在正数组成的等比数列{a n }中，若a 3 a 5 a 7 =3，log 3 a 1 +log 3 a 2 +log 3 a 8 +log 3 a 9 的值为（ ）A.
4 3
B.
3 4
C.
2
D.
3 ^ 4 3
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