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【单选题】
[ɑ]是音位/a/的音位变体之一，其出现条件是：A.
韵尾 [u] 、 [ ŋ] 之前
B.
韵腹是 a ，且无韵尾音节中
C.
韵尾 [i] 、 [ n] 之前
D.
韵头 [i] 或 [y] 及韵尾 [n] 之间
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