问题
选择题
To his parents’ great joy, all their son’s years of hard work finally ____.
A．set off
B．paid off
C．took off
D．got off
答案
答案：B
考察词组。Set off 引爆 pay off取得回报 take off 起飞，腾飞 get off下车
句意为，令他父母感到高兴的是，他们儿子这么多年的努力终于取得了回报。