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-Is John()friend of yours?-Yes.I have known him since be was

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-Is John()friend of yours?-Yes.I have known him since be was
-Is John()friend of yours?
-Yes.I have known him since be was()one-year-old boy.Now John is famous as()artist.
A.a;an;an B.a;a;a C.the;an;an D.a;a;an
选A
第一个不能用the,是因为第一次提到用不定冠词
后面两个用an是因为元音开头.