He has _____ useful book.(填an或a)

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Hehas_____usefulbook.(填an或a)Hehas_____usefulbook.(填an或a)Hehas_____usefulbook.(填an或a)填ausefulu不发元音a因为

He has _____ useful book.(填an或a)
He has _____ useful book.(填an或a)

He has _____ useful book.(填an或a)
填 a
useful u不发元音

a 因为u的发音是“油”不是“阿”