【題目】（題文）________ abstract, Galileo's theory was quite difficult to understand of his time.

A. Sounded B. To sound

C. Sounding D. Having been sounded

【答案】C

【解析】

考查非謂語動詞。句意：因為聽起來很抽象，伽利略的理論在他的那個時代很難理解。分析句子可知，sound用非謂語動詞形式，與其邏輯主語Galileo's theory為主謂關(guān)系，sound表示“聽起來”是系動詞，無被動式，故用現(xiàn)在分詞sounding，故選C。

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