◎ 题干
The United States           up its satellite until January 31,1958.

A. sent
B. didn't send
C. hasn't sent
D. wasn't sent
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“The United Statesup its satellite until January 31,1958. [ ]A. sent B. didn't sendC. hasn't sentD. wasn't sent …”主要考查了你对  【一般过去时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。