问题描述：
英语帝快现身
（ ）modeling business is by no mwans easy to get into the good model will always be in demand.
A.while B.since C.as D.if
（ ）modeling business is by no mwans easy to get into the good model will always be in demand.
A.while B.since C.as D.if
问题解答：
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