问题补充:
on rescuing her sick son, the poor mother has been working 16 hours a day.
A. To bend
B. Being bent
C. Having bent
D. Bent
答案:
A. To bend
B. Being bent
C. Having bent
(答案→)D. Bent
解析:句意:这位可怜的母亲决意要治好她生病的儿子,现在已经工作16个小时了。Bent在这里是形容词: 执意要的;有强烈意向的;决心的,决意的,与on,upon搭配。故选D。
考点: 考查非谓语动词的用法。