—You seem tired, David. —Yes. I _____ al
题型:选择题
问题:
—You seem tired, David.
—Yes. I _____ all day long and can’t wait to go to bed now.
A.am working
B.had been working
C.have been working
D.was working
—You seem tired, David.
—Yes. I _____ all day long and can’t wait to go to bed now.
A.am working
B.had been working
C.have been working
D.was working