With time changing so fast, to keep with time, anyone should be a lifelong learner, or he will fall behind within years.
A. pace
B. stage
C. fare
D. Attitude
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(答案→)A. pace
B. stage
C. fare
D. Attitude
解析：考查固定词组。固定词组keep pace with...跟上；与...并驾齐驱；句意：因为时间变化如此之快，要想跟上时间的变化，任何人都要做一个终身学习者，否则在一年之内他就会落后了。根据句意说明A正确。