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【题目】We are always educated to treasure the present moment,because gone,things will never come back again.

A. while B. since

C. once D. unless

【答案】C

【解析】考查连词。A. while尽管; B. since既然;C. once一旦; D. unless除非句意为:我们常被教育要珍惜当下,因为一旦失去,一切将永远不会再回来。此处为省略结构,补充完整为“once things are gone”,once意为一旦,符合句意。

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