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The country has already sent up three unmanned spacecrafts, the most recent at t

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The country has already sent up three unmanned spacecrafts, the most recent at t

The country has already sent up three unmanned spacecrafts, the most recent ____at the end of last March．

       A．to be launched         B．launched         

       C．being launched        D．has been launched

试题答案

B

解析:

略

标签：unmannedthreespacecraftsmostthe

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