问题 选择题

-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

答案

答案:A

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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