He spent at least as much time reading as you online yesterday.
A. had to chat
B. did chatting
C. do chatting
D. had chatted
网友回答
A. had to chat
(答案→)B. did chatting
C. do chatting
D. had chatted
解析：考查句子结构，did是代替spend，spend time doing，句意是：昨天他花了至少和你网上聊天一样多的时间看书。选B。