2. 金融经济
  3. All materials _____ for the upcoming seminar need to be copied at least two d...

All materials _____ for the upcoming seminar need to be copied at least two d...

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问题 All materials _____ for the upcoming seminar need to be copied at least two days in advance.
选项 A. called
B. required
C. questioned
D. invited
答案B
解析
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