Question

—Have you known Dr. Jackson for a long time?—Yes, since she________ the Chinese Society. A．h

—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

Answer 1

D

该句完整的句式是：I have known Dr. Jackson since she joined the Chinese Society. since后跟的时间状语从句要用一般过去时，表示自从过去某个时间发生的动作到现在以来有多长时间了。