题目列表(包括答案和解析)
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
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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