I’m very tired. I _______ on the night shift for several weeks.
A. worked B. had worked
C. have been working D. have worked
I’m very tired. I _______ on the night shift for several weeks.
A. worked B. had worked
C. have been working D. have worked
C
指过去到现在一直进行的动作。由于“上夜班到现在仍未终止”，故应用完成进行时而不用现在完成时。