Textile business has become more and more difficult (  ) the competition grew.

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问题 Textile business has become more and more difficult (  ) the competition grew.

选项 A、as
B、before
C、since
D、after

答案C

解析 句意为:随着竞争的加剧,纺织品贸易越来越难做了。主句为完成时,所以用since。
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