----How amazing it is that astronauts are exploring auter space!----It's a challenge ,I guess ,()man against nature.A.of B.for C.by D.about为什么B D不行?况且challenge for/to是固定搭配为啥都不行?

问题描述:

----How amazing it is that astronauts are exploring auter space!
----It's a challenge ,I guess ,()man against nature.
A.of B.for C.by D.about
为什么B D不行?况且challenge for/to是固定搭配为啥都不行?