I would have ......... all night if I could, but we all had to leave early because Carmen didn't feel good.
A.sing
B.sung
C.sang
D.singed
正确答案是2
I would have ......... all night if I could, but we all had to leave early because Carmen didn't feel good.
A.sing
B.sung
C.sang
D.singed
正确答案是2