一道单选：Was it during the Second Word War

题目

一道单选：Was it during the Second Word War
Was it during the Second Word War____he died?
A.that
B.while
C.in which
D.then
为什么不选C
带进去的时候he died in the Second World War
那个during 也要带进去?
A选项的that是把during也带进去的吗?
不要回答太复杂的..

答案

it is . that
强调句型 强调是在二战期间
如果是c的话 句子里的during应该去掉