Insciencefictionwereadofflyingsaucerstravelthrough    ...

問題詳情：

 In science fiction we read of flying saucers travel through        space, so people want to have        better knowledge of the universe.

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

【回答】

D

知識點：冠詞

題型：選擇題