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(2011·河南郑州四中第一次调研)The country has already sent up three unmanned spacecraft, the most recent ______ at the end of last March.

  A.has been launched     B.having been launched

  C. being launched      D. to be launched

B考查独立主格结构。根据the end of last March可知动作已经发生,故用现在分词的完成时,因句中的逗号,后用独立主格结构。

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