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—Have you known Dr. Jackson for a long time?
—Yes, since she _________ the Chinese Society.
A.has joinedB.joins
C.had joinedD.joined
D
.
D。since she join the Chinese Society为I have known Dr. Jackson since she join the Chinese Society之省略。连词since所搭配的时态通常是:主句用现在完成时,从句用一般过去时。
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