Without gravity, we _____ walk on the gr
题型:选择题
问题:
Without gravity, we _____ walk on the ground as freely as we do now.
A.couldn’t
B.mustn’t
C.shan’t
D.needn’t
Without gravity, we _____ walk on the ground as freely as we do now.
A.couldn’t
B.mustn’t
C.shan’t
D.needn’t