More attention must be paid the endangered animals..A. to protectingB. protect C. to prot

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(答案→)A. to protecting
B. protect
C. to protect
D. protecting
解析：句意：应当适当注意保护频临灭绝的动物。这里是pay attention to+doing，这里是这个短语的被动形式，to不能省略，故选A。