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 |
推荐套卷
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 |