while和as的区别( )modeling business is by no means easy to get into,the good models will always be in demand.A.while B.as 为什么选A而不选B呢?
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题目内容：
while和as的区别
( )modeling business is by no means easy to get into,the good models will always be in demand.A.while B.as 为什么选A而不选B呢?
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