17. What seems to be a simple idea always turns out   that is hard to put into practice.

A, the one      B. one

C. ones         D. another

17. B考查代詞的用法。句意：看似簡單的想法結果總是成為一個很難實施的想法。這里需要代詞代替an idea，用one可以泛指可數(shù)名詞的單數(shù)；the one是特指可數(shù)名詞單數(shù)；ones 是泛指可數(shù)名詞復數(shù)；another另一個。所以選B。

題目來源：2015全品語法快練高中英語新課標 > 訓練12詞類綜合訓練

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