The country has already sent up 3 unmanned spacecraft, the most recent at the end of last March.A．was launchedB．being launchedC．has been launchedD．having been l-高中英语-n多题

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The country has already sent up 3 unmanned spacecraft, the most recent at the end of last March.

A．was launched	B．being launched
C．has been launched	D．having been launched

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