It was not until liberation that ____to his hometown.did he return he returned

问题描述:

It was not until liberation that ____to his hometown.
did he return
he returned

he returned是答案
这是一个强调句.其固定的框架是
It is/was … that/who …
如果要用did he return 这个句子应该为
Not until liberation did he return to his hometown.
而这句话的正常语序则为:
He didn't return to his hometown until liberation.