-Have you known Dr. Jackson for a long time?-Yes.since she the Chinese Society. A．has joinedB．joinsC．had joinedD．joined 题目和参考答案——青夏教育精英家教网—

—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

答案　D　[考查时态。主句用现在完成时，since引导的从句用一般过去时。]

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