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你問的這個句子裡protect為什麼要用ing形式,我不知道你指的是哪個句子,但是如果動詞protect要用ing形式的話,就可能是作主語,賓語,表語,定語,賓語補足語,例如:Protecting our environment is very important。
They advise protecting the child found him protecting the poor animal.
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