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11、_________abstract, Galileo's theory was quite difficult to understand of his time．

A．Sounding                     B．Sounded

C．To sound                       D．Having been sounded

11、A

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_________abstract, Galileo's theory was quite difficult to understand of his time．

A．Sounding                     B．Sounded

C．To sound                       D．Having been sounded

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