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

出自：大学英语D252

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