Why should old books be saved? [br] The old cover of the book ______.A、Must be u

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问题 Why should old books be saved? [br] The old cover of the book ______.

选项 A、Must be used
B、is sometimes used
C、should never be used

答案 B

解析答案在第三自然段第二至四句(洗过的书页又重新用旧书皮装订起来。有时只有前后两张旧书皮可以重新使用，有时要全部换新书皮)。

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