—Thisisausefuldictionary,Ithink.—Soitis,andit’s

問題詳情：

 —This is a useful dictionary, I think. —So it is, and it’s ______ unusual one.

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

【回答】

B

知識點：冠詞

題型：選擇題