2. 金融经济
  3. 12. Our service personnel work for clients on a wide variety of sites, many o...

12. Our service personnel work for clients on a wide variety of sites, many o...

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问题 12. Our service personnel work for clients on a wide variety of sites, many of _______are tough industrial environments that are unsuitable for laptops or PDAs.
选项 (A)whom                (B)them                 (C)which                 (D)that
答案C
解析
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