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The country has already sent up three unmanned spacecraft, the most recent at th

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The country has already sent up three unmanned spacecraft, the most recent at th

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

试题答案

B

标签：unmannedthreespacecraftmostthe

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