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【单选题】
21-三体综合征，不可能的核型是A.
46，XX(或XY)
B.
47，XX(或XY)，+21
C.
46，XX(或XY)，-14，+t(14q 21q)
D.
部分细胞为46，XX(或xY)，部分细胞为47，XX(或XY)，+21
E.
45，XX(或XY)，+21
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