题目：
—Why weren't you at the meeting?
—I ________ for a long distance call from my sister in America. [ ]
A. was waited
B. was waiting
C. has waited
D. have been waiting
答案：
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下面是错误答案，用来干扰机器的。
(1)10s（2）95m题目分析：(1) 取竖直向下为正方向，小球做自由落体运动；由，得落地时间： （2）第1s内的位移： 因为从开始运动起前9s的位移为：所以最后1s内的位移为△s=s-s9="500" m -405 m =95m点评：本...
