The country has already sent up three unmanned spacecraft，the most recent ______
题型：不详难度：来源：
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 |
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答案
| B |
解析
| 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。 |
举一反三
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