The constant friction of the wire on the metal pulley eventually caused it to break.

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问题 The constant friction of the wire on the metal pulley eventually caused it to break.

选项 A、declining
B、ageing
C、pulling
D、rubbing

答案D

解析 declining：倾斜的，衰退的；ageing：衰老或成熟的过程；pulling：拉动；rubbing：摩擦。题中friction意为“摩擦，冲突”，可知D项符合要求。

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