----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?

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----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?
----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?

----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?
先把I guess删掉再看就清楚了吧
It's a challenge ( ) man against nature.
man against nature 修饰 challenge,所以用of,并非固定搭配的原因.