The American’s long-time painful work finally , for he broke the Guinness World Record for Hula-hoop Spinning(转呼啦圈).
A. paid back
B. fell down
C. paid off
D. fell out
网友回答
A. paid back
B. fell down
(答案→)C. paid off
D. fell out
解析：
试题分析:考查动词短语。A偿还；B摔倒；C得到回报，还清债务；D 脱落。从语境可知这个美国人破纪录了，由此推断是努力有了回报，故C选项正确。句意：这个美国人长期以来艰辛的工作终于有了回报，因为他转呼啦圈而破了世界吉尼斯纪录。