(2011·河北正定中學(xué)第一次月考)15.They experimented _____the new medicine _____animals.

       A.on; to      B by ; on                     C.with ; on       D with; to

C考查介詞的用法。句意:他們用機(jī)器在動物身上做實(shí)驗(yàn)。

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