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单项选择题

A. I found it most interesting to watch, by slowing down my pace, other people walking ahead of me one after another.B. Very few trainers, in world over, come to their work with much knowledge about learning.C. Many city residents complain that there are so few buses in their city that they have to spend much more time waiting for a bus, which is usually crowded with a large number of passengers.D. Because medicine has reduced infant mortality and natural death so significantly, the population has been rising steadily, in spite of serious efforts to reduce the rate of population growth.

许多市民抱怨城市的公交车太少，他们要花很长时间等一辆公交车，而车上可能已满载乘客。
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