—HaveyouknownDr.Jacksonforalongtime?  —Yes,sinceshe

問題詳情：

 —Have you known Dr. Jackson for a long time?

   —Yes, since she ______ the Chinese Society.

   A. has joined        B. joins              C. had joined          D. joined

【回答】

D

知識點：一般過去時及其被動式

題型：選擇題