问题
单项选择题
The footballer has been bouncing the ball for hours on end, and appears capable of more hours.
A．now and then
B．untiringly
C．without interruption
D．breathlessly
答案
参考答案：C
解析：[分析] 固定搭配 on end表：竖着，连续地；A．now and then偶尔；B．untiringly不疲倦地，不屈不挠地； C．without interruption不间断地，继续不断地；D．breathlessly气喘地，屏息地，闷热地；所以答案为C。