【单选题】【消耗次数：1】
We should be pleased to send you some samples of our new printers on approval, _______ our own expenses.
①
at
②
on
③
for
④
in
参考答案：
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相关题目
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______ the storm, we should have reached our company.
①
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①
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①
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①
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①
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【多选题】
国家在社会保障方面的筹资责任体现在
①
对雇主缴纳社会保险费免征税
②
对雇主雇员缴纳社会保险费免征税
③
负担公务员的社会保险缴费
④
当社会保障基金收不抵支时，履行出资责任