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题目

This is a highly ___ new heating system.A. efficiencyB. efficientC. efficiently

This is a highly ___ new heating system.

A. efficiency
B. efficient
C. efficiently

题目解答

答案

B

解析

在英语中，形容词通常用来修饰名词，而副词用来修饰动词、形容词或其他副词。在这个句子中，"highly" 是一个副词，它需要修饰一个形容词。选项 A "efficiency" 是名词，选项 C "efficiently" 是副词，而选项 B "efficient" 是形容词，因此是正确的选择。

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