We should try our best to stop the endangered animals formA killed B killing C being killed D to be killed

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We should try our best to stop the endangered animals formA killed B killing C being killed D to be killed
We should try our best to stop the endangered animals form
A killed B killing C being killed D to be killed

We should try our best to stop the endangered animals formA killed B killing C being killed D to be killed
C
stop sb/sth from doing sth
防止某人做某事
又因被动语态,所以是being done.

C