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—This is a useful dictionary, I think.—So it is, and it's     unusual one.A. the B. an C. a D. 不填

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an, a    a, the    the, a    a, a  
how    what    what a    what an  
buy    bought    to buy    to be bought  
an;a  a;a  a;the  an;the  
a, one    a, it    an, that    an, one  
a; the  the; an  the; a  the; the  
An; an  An; a  /; an  the; the  
an; a  /; an  a; the  /; a  
a    an    the    /  
The , an    An , the    The , a    The , the  
very a    very an    quite a    quite an  
/ an ; a    a ; the    the ; a    a ; a  
such an useful; greatly value    such a useful; great value    so useful a; great valuable    so a useful; greatly valuable  
much useful    of useful    very use    of use  
an, a  a, the  the, a  a, a  
of much use    of great useful    much useful    for much use  

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