She has put on a lot of weight since she got out of the hospital.

She has put on a lot of weight since she got out of the hospital.
A.自从出院以来她挑起了工作的重担。
B.自从出院以来她长胖了许多。
C.因为她出院了， 所以挑起了工作的重担。
D.她长胖了是因为她出院了。
正确答案：自从出院以来她长胖了许多。