题目内容

-I joined the League _____ May 4th, 20ll.  What about you
-I have been a League member ______ three years ago.
A.in; forB.on; for .C.in; sinceD.on; since
D
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。
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