April 20th ,2013,earthquake hit Ya an.A.an B.a C,不填 D.the

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April 20th ,2013,earthquake hit Ya an.A.an B.a C,不填 D.the

April 20th ,2013,earthquake hit Ya an.A.an B.a C,不填 D.the
April 20th ,2013,earthquake hit Ya an.A.an B.a C,不填 D.the

April 20th ,2013,earthquake hit Ya an.A.an B.a C,不填 D.the
应该选 an
这里是泛指 “一场地震”.
on April 20th ,2013,【an 】earthquake hit Ya an