was it during the second world war _______he died?

题目

was it during the second world war _______he died?
A.that
B.while
C.when
选什么?一定说明原因

答案

A.that It is...that...强调句型,强调他死于二战时期.去掉It is...that...句子依然成立,变为He died during the second world war.