题文
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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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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