◎ 题干
Her little son fell off the boat into the water due to her carelessness. The mother couldn't help _____
because she couldn't help _____ her son out of the danger.  
[     ]
A. crying; to save  
B. crying; saving    
C. to cry; to save    
D. cry; saving
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◎ 解析
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◎ 知识点
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