【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.
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we lost
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plenty
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Once our chickens started laying eggs, we had such a _____of eggs that we were giving many away to our neighbors.
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output
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surplus
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plenty
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