—Have you known Dr. Jackson for a long time?
—Yes, since she        the Chinese Society.
A．has joinedB．joinsC．had joinedD．joined
D
句意：—你認(rèn)識杰克遜博士很久了嗎？—是的，自從她加入中國協(xié)會以來。顯然，這是一個過去的動作，故要用一般過去時。
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