I wonder who cleaned the house yesterday. It ()have been John because he and I were out of town all day.
A.
mustn’t
B.
needn’t
C.
couldn't
D.
won’t
正确答案是C
I wonder who cleaned the house yesterday. It ()have been John because he and I were out of town all day.
I wonder who cleaned the house yesterday. It ()have been John because he and I were out of town all day.
A.
mustn’t
B.
needn’t
C.
couldn't
D.
won’t
正确答案是C