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

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

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问题 Costs for regulation of business actually are a hidden tax severely reducing the competitiveness of domestic businesses ______ when they face an increasingly global marketplace.
选项 A、at times
B、at present
C、at once
D、at a time
答案D
解析 此题的定语从句需要一个表示“一度”或“曾经一段时间”的短语。
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