单项选择 .从每小题A.B.C.D中选出一个能填入句中空白处的最佳答案. This is useful dictionary. I bought it in shop next to the post

单项选择 ，从每小题A、B、C、D中选出一个能填入句中空白处的最佳答案。

This is ________ useful dictionary. I bought it in ________ shop next to the post office.

A. an; a B. an; the C. a; an D. a; the

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D