是的,与since有关.since接过去的时间表点,如果用从句表示这个时间点,这个从句要用一般过去时.这句话是省略句,补全后是:
I have known Dr.Jackson since she joined the Chinese Society.
是的,与since有关.since接过去的时间表点,如果用从句表示这个时间点,这个从句要用一般过去时.这句话是省略句,补全后是:
I have known Dr.Jackson since she joined the Chinese Society.