i think its___useful advice ,so i will always remember it.填a an the 选一个.

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i think its___useful advice ,so i will always remember it.填a an the 选一个.
i think its___useful advice ,so i will always remember it.填a an the 选一个.

i think its___useful advice ,so i will always remember it.填a an the 选一个.
the表示特指,这里没有特指advice的意思
useful第一个发音是元音.因此用an

AN useful前面是元音嘛。。。

an,useful是元音u开头的

useful 不是元音开头，不能用an，用a

填an,因为它后面是useful
也就是只是元音字母(a e i o u)开头的单词前须用an,useful以u开头,所以!

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