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
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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：A