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  3. Although measures have been introduced to discourage the use of mobile teleph...

Although measures have been introduced to discourage the use of mobile teleph...

admin2020-12-24  69
问题 Although measures have been introduced to discourage the use of mobile telephone inside the opera house, ___effectiveness remains limited.
选项 A. they
B. their
C. them
D. theirs
答案B
解析
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