it was a soldier who happened to be there___saved the girl from the danger.应该填that,为什么

it was a soldier who happened to be there___saved the girl from the danger.应该填that,为什么
it was a soldier who happened to be there___saved the girl from the danger.应该填that,为什么

it was a soldier who happened to be there___saved the girl from the danger.应该填that,为什么
强调句型