◎ 题干
It was very difficult to rescue the drowning boy in the sea. One moment the rescue workers ____him
but the next moment they _____.    
[     ]
A. caught sight of; lost                
B. caught the sight of; lost his sight  
C. caught sight of; lost sight of him      
D. caught the sight of; lost their sight of him
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◎ 解析
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◎ 知识点
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