【单选题】【消耗次数：1】
滑动导轨的优点不包括（ ）
①
制造方便
②
抗振性低
③
结构简单
④
刚度好
参考答案：
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what
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which
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that
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why
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interesting, interesting
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interested, interested
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interested, interesting
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although ?
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as ?
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while ?
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once ?
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conveyed
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concluded
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covered
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filled
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It was when Tom got to the office ____ the telephone rang.
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which
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that
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how
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what
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—How long____ you ____the library book? —For three days.
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have--borrowed
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have--kept
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has just been made ?
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A teacher as he is
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Teacher as he is
③
As a teacher
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