-How amazing it is that astronauts are exploring outer space!--It’s a challenge, I

发布时间：2020-08-17 12:33:26

  ---How amazing it is that astronauts are exploring outer space!
----- It’s a challenge, I guess,     man against nature. 
A. of
B. for
C. by
D. about

网友回答

(答案→)A. of
B. for
C. by
D. about
解析：考查介词。应答句中的I guess是插入语，因此所填介词与challenge连用，表所属，用of，选A。
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