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
　獨立主格結構作狀語，排除謂語動詞形式，即A項。“the most recent”與“l(fā)aunch”為邏輯上的被動關系，且“l(fā)aunch”在謂語動詞之前發(fā)生。
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