they took the sick boy to the hospital at once改为被动语态 at once放在哪里,by them 放在哪

题目

they took the sick boy to the hospital at once改为被动语态 at once放在哪里,by them 放在哪

答案

The sick boy was taken to the hospital at once by them.
The sick boy was taken by them to the hospital at once .
两种说法都行,前者更好一些.