Paul started hiking in 2010 and he has hiked across 11 countries .A. ever sinceB. from the

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(答案→)A. ever since
B. from then on
C. right away
D. at once
解析：这题考查词组：ever since自从，from then on从那时起，right away 立刻，       at once立刻，句意是：Paul2010年开始远足，自从那时他已经走了11个国家了。时态是has hiked所以用ever since。选A。