He has never left the city since he moved to Shanghai three years ago. 改为同义句

Question

He has never left the city since he moved to Shanghai three years ago.
改为同义句
He moved to Shanghai three years ago and has never left the city ____ _____.
ever since
even once
so far
up till now
哪些正确？

Answer 1

对应的同义语：
He has always stayed in Shanghai since he moved in three years ago.

Answer 2

ever since,since then都是可以的

Answer 3

ever since .追问

其他三个都不可以吗？为什么呢？

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