Although they were tired they still went on . A. working B. to workC. workD. worked

问题补充：

Although they were tired, they still went on .

A. working

B. to work

C. work

D. worked

答案：

(答案→)A. working

B. to work

C. work

D. worked

解析：句意:虽然他们很累了，他们仍然继续工作。go on doing sth. 继续做同一件事情；go on to do sth. 继续做另外一件事情。根据句意可知他们继续做的是同一件事情，即继续工作，故选A。