填冠词.2.This is a useful dictionary,I think.So it is,and it's( ) unusual one.

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填冠词.2.Thisisausefuldictionary,Ithink.Soitis,andit''s()unusualone.填冠词.2.Thisisausefuldictionary,Ithink

填冠词.2.This is a useful dictionary,I think.So it is,and it's( ) unusual one.
填冠词.2.This is a useful dictionary,I think.So it is,and it's( ) unusual one.

填冠词.2.This is a useful dictionary,I think.So it is,and it's( ) unusual one.
it's( an) unusual one