The country has already sent up 3 unmann
问题:
The country has already sent up 3 unmanned spacecraft, the most recent at the end of last March.
A.was launched
B.being launched
C.has been launched
D.having been launched
The country has already sent up 3 unmanned spacecraft, the most recent at the end of last March.
A.was launched
B.being launched
C.has been launched
D.having been launched