The country has already sent up three unmanned spacecraft, the most recent
题型:不详难度:来源:
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 |
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答案
B |
解析
the most recent having been launched构成独立主格结构。the most recent指最近发射的载人飞船,与launch是被动关系所以要用动词+ing形式的完成式的被动式。 |
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