More attention must be paid the endangered animals..A. protect B. to protectC. to protecti

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A. protect
B. to protect
(答案→)C. to protecting
D. protecting
解析：考查短语pay attention to的用法。pay attention to中to为介词，后面要接动名词，故选答案C。本题是一个被动句，为了更容易看出考点，可以先还原成主动句：we must pay more attention     the endangered animals.这样很容易看出是考pay attention to的用法。