Pigeonshavebeenusedtocarrythenewssinceancienttimes.Itw...

问题详情：

 Pigeons have been used to carry the news since ancient times. It was in war ____ they found their great use.

  A. that          B. what       C. where         D. which

【回答】

A

知识点：强调句

题型：选择题