问题
选择题
The naughty boy _____ to me that the hen_____ there just now had_____ two eggs the day before. [ ]
A. laid, laid, laid
B. 1ied, lying, laid
C. 1ied, laid, lain
D. 1aid, lay, lain
答案
答案：B
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＝ m/s，该物体运动的轨迹为一抛物线，其轨迹方程为 。g取10m／s2