The United States ( ) up its satellite until January 31,1958.A.sent B.did not send C,has not sent D.was not sent选B,请帮我分析一下,谢谢!

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TheUnitedStates()upitssatelliteuntilJanuary31,1958.A.sentB.didnotsendC,hasnotsentD.wasnotsent选B,请帮我分

The United States ( ) up its satellite until January 31,1958.A.sent B.did not send C,has not sent D.was not sent选B,请帮我分析一下,谢谢!
The United States ( ) up its satellite until January 31,1958.
A.sent B.did not send C,has not sent D.was not sent
选B,请帮我分析一下,谢谢!

The United States ( ) up its satellite until January 31,1958.A.sent B.did not send C,has not sent D.was not sent选B,请帮我分析一下,谢谢!
not until是直到什么时候才
这里要表达的意思是美国直到1958年1月31日才发射人造卫星,也就是说之前都没有发射
要用not until

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