This is a simple idea, but that is hard to put into practice.

A. one B. it C. that D. those

A

【解析】

試題分析：考查代詞的用法。這里的one是代詞，one代替前面出現(xiàn)的 a simple idea，是泛指概念，相當(dāng)于a+名詞。One同時后面that引導(dǎo)的定語從句的先行詞。句意：這是一個簡單的想法，但是它很難付諸實(shí)踐。

考點(diǎn)：考察代詞用法。

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