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Don’t promise anything ______ you are one hundred percent sure.

A. whether      B. after     C. how     D. unless

D


解析:

本题考查的是状语从句的连接词用法。本句的意思是:除非你有百分之百的把握,否则不要答应任何事。A项whether表示“是否”;B项after表示“在---之后”;C项how表示“怎样,如何”;D项unless表示“除非,如果不”。根据句意,应该选D。

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High school students in Western countries such as the United States and Canada usually have a prom to mark their graduation. It’s to mark the time kids turn into young men and women. After the prom, teenagers either go to college or find a job. It means they are no longer as dependent on their parents as they were before.
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