He has worked very hard ______ he entered the factory.
A: when
B: till
C: while
D: since
A: when
B: till
C: while
D: since
举一反三
- He has worked in this factory _________ 1980. A: since B: for C: when D: in
- He ( ) at the factory since he came here. A: worked B: has worked
- He said he ____ in that factory since 2005. A: has worked B: had worked
- Jack<br/>___ in this factory since he came here. A: has<br/>worked B: was working C: works
- He has worked very hard in this term and ______ he will pass the final exam. A: eventually B: yet C: finally D: accordingly