2. 金融经济
  3. All passengers should present their _____ documents at the check-in counter.A. b

All passengers should present their _____ documents at the check-in counter.A. b

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问题 All passengers should present their _____ documents at the check-in counter.
选项 A. boarded
B. boarding
C. to board
D. boards
答案B
解析
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