— The door was open.— It () open. I had locked it myself and the key was in my pocket.
A.can't be
B.mustn't
C.can't have been
D.mustn't have been
正确答案:can't have been
— The door was open.— It () open. I had locked it myself and the key was in my pocket.
A.can't be
B.mustn't
C.can't have been
D.mustn't have been
正确答案:can't have been