英语单项选择,并求讲解
A little boy wrote____"u"and____"n" on the wall
A.an,a B.an,an C.a,a D.a,an
Mrs.Smith is___friend of ____.
A.the,mine B.a,me C.the,my D.a,mine
He ordered ____book some time ago and now___book has arrived.
A.the,a B.a,a C.the,the D.a,the