High-speed trains travel at 300 kilometers an hour，which is about normal trains．
| A．four times the speed as | B．the speed four times of |
| C．four times as the speed of | D．four times the speed of |
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High-speed trains travel at 300 kilometers an hour，which is about normal trains．
| A．four times the speed as | B．the speed four times of |
| C．four times as the speed of | D．four times the speed of |
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