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

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

D


解析:

本題考查的是狀語從句的連接詞用法。本句的意思是：除非你有百分之百的把握，否則不要答應(yīng)任何事。A項(xiàng)whether表示“是否”；B項(xiàng)after表示“在---之后”；C項(xiàng)how表示“怎樣，如何”；D項(xiàng)unless表示“除非，如果不”。根據(jù)句意，應(yīng)該選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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