2. 外语
  3. Although measures have been introduced to discourage the use of mobile telephones inside the opera house,______effectiveness rem

Although measures have been introduced to discourage the use of mobile telephones inside the opera house,______effectiveness rem

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问题 Although measures have been introduced to discourage the use of mobile telephones inside the opera house,______effectiveness remains limited.
选项 A、they
B、their
C、them
D、theirs
答案B
解析 空格后的effectiveness是名词，意思是“效果”。修饰名词时应该用所有格，所以只有their正确。their指的是之前提到的measures“对策，措施”。
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