-IjoinedtheLeague

来源：语文精选馆 2.7W

-I joined the League _____ May 4th, 20ll. What about you

-I have been a League member ______ three years ago.

A. in; for B. on; for . C. in; since D. on; since

【解析】此题重点考查介词的基本用法。确指某一天的时候要用介词on。Since表示自从…后跟点时间，常用在完成时中。