题目内容

Knowledge from real life isn't easier to forget than ___ achieved from textbooks.
A.itB.thatC.oneD.those
B
考察代词用法。It指代上文提及的同一事物;that指代可数名词复数或不可数名词,后面要有定语限定,those是其复数形式。One指代上文提及的可数名词单数.根据句意可知本题that代替不可数名词knowledge.
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