（题文）________ abstract, Galileo's theory ...

（题文）________ abstract, Galileo's theory was quite difficult to understand of his time.

A. Sounded B. To sound

C. Sounding D. Having been sounded

C 【解析】考查非谓语动词。句意：因为听起来很抽象，伽利略的理论在他的那个时代很难理解。分析句子可知，sound用非谓语动词形式，与其逻辑主语Galileo's theory为主谓关系，sound表示“听起来”是系动词，无被动式，故用现在分词sounding，故选C。

考点分析：

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