关于be supposed to do
问题描述：
关于be supposed to do
the security of the babies is supposed to ___ by the nurses.
为什么是 be seen to 而不是 be seen?
答
这里是词组see to的被动式,意思为“照料,看管,负责”,see to是个词组,类似deal with,see about,take care of,look after.
我们用还原法来做：The nurses is supposed to see to the security of the babies.