He is going to buy _______ useful book.And _______ book is on science.（ ）
| A． |
a；an |
B． |
a；the |
C． |
an；an |
D． |
an；the |
He is going to buy _______ useful book.And _______ book is on science.（ ）
| A． |
a；an |
B． |
a；the |
C． |
an；an |
D． |
an；the |
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