______ with steam engines, turbines have much higher efficiency.

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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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