LastmonthIwasluckyenoughtohaveachancetomakeatripinto

問題詳情：

 Last month I was lucky enough to have a chance to make a trip into _____ space with my friend Li Yanping, _____ astronomer.

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

【回答】

D

知識點：冠詞

題型：選擇題