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SAT (To trap and remove) large alligators greatly affected t

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SAT
(To trap and remove) large alligators greatly affected the ecosystems of some southeast swamplands.
这里为什么要改成 the trapping and removal of large alligators?
SAT (To trap and remove) large alligators greatly affected t
不定式能做主语
主要是不定式表示的将来,所以错了.换成动名词,表示正在发生或者已经发生了.
我很肯定,OC上又一个题,官方的解释是这样的.