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- 单项选择题The board deemed it’s urgent that these invitations （） first thing tomorrow morning. ( 章节：1 难度：3)
A、had to be put in the mail
B、must be put in the mail
C、be put in the mail
D、should have been put in the mail
- C
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A、had to be put in the mail
B、must be put in the mail
C、be put in the mail
D、should have been put in the mail
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