问题补充:
There were lots of people standing watching, yet no one of them .
A. offered to help
B. offered helping
C. was offered to help
D. was offering help
答案:
(答案→)A. offered to help
B. offered helping
C. was offered to help
D. was offering help
解析:考查词组:句意:有很多人站着看,但是没有人主动帮忙。Offer to do sth主动提出做,因为people和offer是主动关系,用主动式,选A。