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They claim that this engine is ______ the previous one .

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They claim that this engine is ______ the previous one .
A.twice as powerful as B.as twice powerful as C.powerful as twice as D.twice powerful as
选A.翻译为:他们声称这个引擎(发动机)的功率是以前那个的两倍.
考察英语中倍数的表达方法.大都有两种表示,可利用以下例子进行记忆:
例:1、This bridge is twice as long as that one. 这座桥是那座桥的2倍长.
2、This bridge is twice longer than that one. 这座桥比那座桥长2倍.