听力原文：Mary was so exhausted last night that she dropped off to sleep in the chair instead of getting up and going to beD.(28)A.She dropped off the chair last night.B.She went to buy some bedroom furniturE.C.She didn't sleep last night.D.She slept in the chair rather than on the beD.
A.(28)
A.She
B.
B.She
C.
C.She
D.
D.She
E.