He's been working in the field ______ early this morning.
A: for
B: after
C: since
D: by
A: for
B: after
C: since
D: by
举一反三
- I ______ on a maths problem when he telephoned me early this morning. A: [A] had worked B: [B] was working C: [C] have worked D: [D] have been working
- She has been working in this factory ______. A: after 1968 B: in 1968 C: since 1968 D: for 1968
- There was an accident in this street this morning and _________ there has been a severe congestion of traffic. A: until that B: since then C: for which D: after that
- He said he _______ a report since two o’clock that morning. A: had been writing B: have been writing C: wrote D: have written
- She has been working in this factory (). A: in 1980 B: after 1980 C: since 1980 D: until 1980