用不定冠词a或an填空，不需要的填“/”

Question

＿＿＿“e” is in “ruler”.
＿＿＿“m” is in “map”.
＿＿＿“u” is in “you”.

Answer 1

你好

An
An
A

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Answer 2

【an】“e” is in “ruler”.
【an】“m” is in “map”.
【a 】“u” is in “you”.