The country has already sent up three unmanned spacecraft, the most recent ______________at theend o

题目简介

The country has already sent up three unmanned spacecraft, the most recent ______________at theend o

题目详情

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
题型:单选题难度:中档来源:同步题

答案

B

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