( )Mr.John has worked in that small city __________ he left Canada in 1998.

问题描述:

( )Mr.John has worked in that small city __________ he left Canada in 1998.
A.since B.for

很高兴能够在这里回答你的问题,这道题的正确答案应该为:
选A
现在完成时,后面的时间为一个时间点,所以用since
for后跟一段时间