The lecturer began by us where the island was and went on about its history.A. telling

问题补充：

The lecturer began by us where the island was, and went on about its

history.

A. telling；talking

B. to tell；to talk

C. telling；to talk

D. he told；talking

答案：

A. telling；talking

B. to tell；to talk

(答案→)C. telling；to talk

D. he told；talking

解析：go on doing指继续做同一件事；go on to do指继续进行到下一件事。