问题
选择题
______his work, he decided to go skating with his friends .
To finish B. Finishing C. Finished D. Having finished
答案
答案：D
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______his work, he decided to go skating with his friends .
To finish B. Finishing C. Finished D. Having finished
答案：D
=12m/s，达到最大速度后匀速运动。则警车发动起来后至少要多长的时间才能追上违章的货车？