Once recovered, Louis chose to return to the front lines in France. It was there, at the Battle of the Somme in 1916, that Louis died in action.
请问老师:It was…that…是强调句型,强调there地点状语,那么后面的at the Battle of the Somme in 1916是做插入语吗,还是什么成分呢?介词短语是不能作同位语,那这里不能看作同位语。求指教!谢谢