题文
—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 |
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—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 |
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