题目内容
The country has already sent up three unmanned spacecraft，the most recent ________ at the end of last March.
| A．has been launched | B．having been launched |
| C．being launched | D．to be launched |
B
独立主格结构作状语，排除谓语动词形式，即A项。“the most recent”与“launch”为逻辑上的被动关系，且“launch”在谓语动词之前发生。
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