2. 外语
  3. Costs for regulation of business actually are a hidden tax severely reducing the competitive ness of domestic businesses ______

Costs for regulation of business actually are a hidden tax severely reducing the competitive ness of domestic businesses ______

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问题 Costs for regulation of business actually are a hidden tax severely reducing the competitive ness of domestic businesses ______ when they face an increasingly global marketplace.
选项 A、on occasions
B、at a time
C、under the circumstances
D、at once
答案B
解析 句意：商务规章实际上是一种隐性税收，面临国际市场时，它严重降低了国内商务的竞争力。at a time某时。
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