2. 外语
  3. ______ with steam engines, turbines have much higher efficiency.

______ with steam engines, turbines have much higher efficiency.

admin2012-08-05  34
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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