39．The country has already sent up three unmanned spaceship, the most recent at the end of las——青夏教育精英家教网—

摘要：39．The country has already sent up three unmanned spaceship, the most recent at the end of last March． A．has been launched B．having been launched C．being launched D．to be launched

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The country has already sent up three unmanned spaceship, the most recent ________ at the end of last March．