Question

他上大學以后就沒學英語。

1. A.
   He hasn’t learned English since he was a college student．
2. B.
   He hasn’t learned English since he has been a college student．
3. C.
   He hasn’t learned English since he left college．
4. D.
   He hasn’t learned English since he has left college．

Answer 1

B
since后加短暫性動詞的一般過去時或延續性動詞的完成時。