问题
选择题
Paul started hiking in 2010 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
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。