2. 外语
  3. Since the beginning of 2013, these regulations ______ in most workplaces across the country.

Since the beginning of 2013, these regulations ______ in most workplaces across the country.

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问题 Since the beginning of 2013, these regulations ______ in most workplaces across the country.
选项 A、will be introduced
B、are introduced
C、have been introduced
D、were introduced
答案C
解析 现在完成时表示过去发生的动作持续到现在或者过去发生的动作对现在造成的影响或结果，“since+时间点”或“for+时间段”是现在完成时的标志。题干中出现Since the beginning of 2013，且强调过去发生的动作对现在的影响，故应使用现在完成时，因此确定本题答案为C)。
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