◎ 题干
It was reported that the passenger ship was sailing eastwards in the Atlantic Ocean ____ its captain
and some passengers on board____ something supposed to be a UFO flying overhead.     
[     ]
A. while; caught sight of                
B. when; caught sight of  
C. as; saw                            
D. since;  caught a sight of
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◎ 解析
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◎ 知识点
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