再( )里填a或anthis is( )english book. is that( )orange? is’t not ( )ruler. jane is not from( )china. that is ( )mr.lee. this is ( )O. are you ( )twelve?

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再( )里填a或an
this is( )english book. is that( )orange? is’t not ( )ruler. jane is not from( )china. that is ( )mr.lee. this is ( )O. are you ( )twelve?

an
an
a
不填
a
an
a