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Don't you think that a foreign language is useful tool?A.xB.anC.aD.the

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Don't you think that a foreign language is useful tool?A.xB.anC.aD.the

Don't you think that a foreign language is ________ useful tool?

A.x

B.an

C.a

D.the

试题答案

C

useful是以半元音开头的,因此要加a不加an.