单选题：Some component parts should be replaced regularly because__

题目分类：成人英语三级
题目类型：单选题
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题目内容：

Some component parts should be replaced regularly because______． A．they are outdated
B．they need to be oiled
C．they become worn out
D．they are easily available

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分类：成人英语三级题型：单选题

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