◎ 题干
The manager of the travel agency was trying hard to figure out how he would attract more customers ____ an extraordinary idea _____  his mind and he immediately knew what to do.     
[     ]
A. when; flashed across  
B. as; crossed  
C. when; hit  
D. before; struck
◎ 答案
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◎ 解析
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◎ 知识点
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