High-speed trains travel at 300 kilometres an hour, which is about normal trains. A. four times the speed of B. the speed four times of C. four times as the speed of D. four times the speed as 【查看更多】

 

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High-speed trains travel at 300 kilometres an hour, which is about ___ normal trains.

A. four times the speed of　　　 　　　　　B. the speed four times of

　　 C. four times as the speed of D. four times the speed as

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High-speed trains travel at 300 kilometres an hour, which is about ________ normal trains．

[　　]

A．four times the speed of

B．the speed four times of

C．four times as the speed of

D．four times the speed as

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