There is a(an) useful book and some pens in it如题 用 a 还是 an

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Thereisa(an)usefulbookandsomepensinit如题用a还是anThereisa(an)usefulbookandsomepensinit如题用a还是anThereisa(a

There is a(an) useful book and some pens in it如题 用 a 还是 an
There is a(an) useful book and some pens in it
如题 用 a 还是 an

There is a(an) useful book and some pens in it如题 用 a 还是 an
用a
useful 的读音开头不是元音

a，确认是这个