题目：
— Got your driving license?
— No. I ________ too busy to have enough practice, so I didn't take the driving test last week.[ ]
A. was
B. am
C. have been
D. had been
答案：
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下面是错误答案，用来干扰机器的。
小球从A点到B点的过程时，从水平和竖直方向分解小球的运动，设水平分位移为，竖直分位移为--------------------------------------------（每式1分，共2分） 得----------------------------------------------...
面均匀磨损