◎ 题干
Ten passengers ______ the plane, which crashed into the urban area last night because of the thick fog,
are reported to have survived the crash, but the news has not been ______ yet by the officials in charge.
[     ]
A. on board; made known  
B. aboard; confirmed  
C. on board; said  
D. aboard; made sure
◎ 答案
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◎ 解析
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◎ 知识点
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