The country has already sent up three unmanned spacecraft, the most recent__at the end of last March.
A．has been launchedB．having been launched
C．being launchedD．to be launched
B

試題分析：考查獨(dú)立主格結(jié)構(gòu)：句意：這個(gè)國(guó)家已經(jīng)發(fā)射了三顆無(wú)人飛船，最近的在去年三月份被發(fā)射。句中沒(méi)有連接詞，故不能選作謂語(yǔ)動(dòng)詞的A項(xiàng)；由at the end of last March可知應(yīng)選用表示動(dòng)作完成the most recent having been launched為獨(dú)立主格結(jié)構(gòu)，選B項(xiàng)。
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