英语单选题目,Mary said she never seen_UFO before.a.a b.an c.the d./

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英语单选题目,Mary said she never seen_UFO before.a.a b.an c.the d./

英语单选题目,Mary said she never seen_UFO before.a.a b.an c.the d./
英语单选题目,
Mary said she never seen_UFO before.a.a b.an c.the d./

英语单选题目,Mary said she never seen_UFO before.a.a b.an c.the d./
A 因为元音因素前用an 修饰,而,U是元音字母,不是音素.