为了合理分布空车和保证装车需要进行的车流调整称为（）
A.重车调整
B.空车调整
C.备用车调整
D.方向别装车调整
参考答案：B
You have never seen such a wonderful film before, __________ ? [ ]
A. haven't you
B. have you
C. do you
D. don't you
