______ with steam engines, turbines have much higher efficiency.A、ComparedB、Whi

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问题 ______ with steam engines, turbines have much higher efficiency.

选项 A、Compared
B、While comparing
C、Compare
D、Comparing

答案 A

解析非谓语动词题。compare的逻辑主语是turbines，两者是动宾关系，所以compare用过去分词形式。

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