the history teacher told the students that World War ___ in 1914.Ahad broken outB was broken outC broken out Dhad been broken out
the history teacher told the students that World War ___ in 1914.Ahad broken outB was broken outC broken out Dhad been broken out
the history teacher told the students that World War ___ in 1914.
Ahad broken outB was broken out
C broken out Dhad been broken out
the history teacher told the students that World War ___ in 1914.Ahad broken outB was broken outC broken out Dhad been broken out
此题选择C.背题考查的是短语 break out（爆发）,该短语无被动语态!跟据主从时态一致的原则,主句的谓语told是一般过去时态,所以从句也要用 break out的过去式 broken out !
B,客观事实用原本的时态，即过去式。
望采纳.
a
过去完成时，表示过去的过去，一战在历史老师的told动作之前已经发生了。
C. 瞬间动词
a
本人认为用broke out更好，但在没有这个选项的时候，只能选a，表示过去的过去，break out爆发，要用主动语态，其他选项都是被动语态了。历史老师告诉学生世界大战爆发于1914年。
break out vt.& vi.（战争、打斗等不愉快事件）突然发生，爆发
直接用主动语态，不用被动，再因为后面有in 1914，是指那年发生的事情，不用完成时。
选C。（C答案应该是broke out吧）