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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

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

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

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

The country has already sent up three unmanned spacecraft, the most recent ________ at the end of last March.