(2011·河南鄭州四中第一次調(diào)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考查獨(dú)立主格結(jié)構(gòu)。根據(jù)the end of last March可知?jiǎng)幼饕呀?jīng)發(fā)生,故用現(xiàn)在分詞的完成時(shí),因句中的逗號(hào),后用獨(dú)立主格結(jié)構(gòu)。

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