1．He spent at least as much time reading as you _______on line yesterday.
A. had to chat B. do chatting
C. had chatted D. did chatting
【答案】D
【解析】考察替代的形式。本题的did代替spent,第二个as是关系代词，代替time作为did(spent)的宾语，构成spend some time （in） doing sth花费时间做某事；故D正确。句意：昨天他花在阅读上的时间和花在网上聊天的时间一样多。
