modeling business is by no means easy to get into, the good model will always be in demand.
A. While
B. Since
C. As
D. If
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(答案→)A. While
B. Since
C. As
D. If
解析：考查连词辨析。A当…时；然而；尽管；B既然，自从；C随着；D如果；句意：尽管模特行业绝不是容易进入的，但是总需要好的模特。本句中的while=though尽管。故A正确。