The country has already sent upthree unmanned spacecrafts, the most recentat the end of last March.[

题目简介

The country has already sent upthree unmanned spacecrafts, the most recentat the end of last March.[

题目详情

The country has already sent up  three unmanned spacecrafts, the most recent            at the
end of last March.    
[     ]
A.has been launched          
B.having been launched    
C.being launched            
D.to be launched
题型:单选题难度:中档来源:同步题

答案

 B

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