We should take some measures to wild animals .
A. protect ; from being killed
B. prevent; from killing
C. keep; being killed
D. stop; from killing
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(答案→)A. protect ; from being killed
B. prevent; from killing
C. keep; being killed
D. stop; from killing
解析：句意：我们应该采取一些措施来保护野生动物不被杀死。这里使用了protect/ stop/keep +宾语+from doing“阻止…做…”其中prevent和stop后面的from都可以省略，keep后面的from不能省，因为如果省略了，就是“让…一直做”，所以C不对，还有因为animals和kill是被动关系，所以用动名词的被动，选A.