◎ 题干
On their way to the reception building, all the athletes were amazed _______ so many volunteers ____
their help.     
[     ]
A. finding; politely offering                    
B. to find; polite to offer  
C. finding; politely to offer                      
D. to find; politely offering
◎ 答案
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◎ 解析
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◎ 知识点
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