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

问题补充：

Paul started hiking in and he has hiked across 11 countries .

A. ever since

B. from then on

C. right away

D. at once

答案：

(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：Paul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。