Thenumberoftheendangeredanimals,forexamplethetiger,

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The number of the endangered animals, for example the tiger, ______ by over 40% in the past few years.

A. falls B. has fallen C. fell D. will fall

解析：in the past few years意为“在过去的几年里”，是现在完成时的时间状语。故选B。