18. 計算
×1+
×3+
×5+
×7+
×9=?
(A)10
(B)15
(C)20
(D)25
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統計: A(9), B(52), C(13), D(10), E(0) #1403744
統計: A(9), B(52), C(13), D(10), E(0) #1403744