-Have you known Dr. Jackson for a long time? -Yes, since she the Chinese Society

 —Haveyou known Dr. Jackson for a long time?

—Yes, sinceshe________ the Chinese Society.

A. hasjoined          B.joins                        C. had joined                D. joined

试题答案

【答案】

 D

该句完整的句式是：Ihave 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。