3, 6, 8, 13, 20, (), 51
A.31
B.28
C.42
D.32
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3,6,8,13,20,(),51 A.31B.28C.42D.32
3, 6, 8, 13, 20,______, 51 () A.31 B.28 C.42 D.32
3, 6, 8, 13, 20, (), 51 A.31 B.28 C.42 D.32
3,6,8,13,20,(),51 A.31B.28C.42D.32
3,6,8,13,20,(),5i。 A.31B.28C.42D.32
3 5 8 13 20 ()。A.31 B.33 C.37 D.44