It was not until 1945 the Second World War came to an end people began to realize the

问题补充：

It was not until 1945, the Second World War came to an end, people began to realize the eventual coming of peace.

A. when; which

B. when; that

C. that; which

D. that; that

答案：

A. when; which

(答案→)B. when; that

C. that; which

D. that; that

解析：句意：直到第二次世界大战结束的1945年，人们开始意识到和平终于到来了。第一空填when，引导定语从句，修饰1945，定语从句中缺少时间状语，第二空填that，这里是强调句：it was not until…that…，所以选B。