2. 外语
  3. The librarian at the desk promised to get the book for me _____ it was returned.

The librarian at the desk promised to get the book for me _____ it was returned.

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问题 The librarian at the desk promised to get the book for me _____ it was returned.
选项 A、unless
B、therefore
C、once
D、if only
答案C
解析
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四川省大学英语三级

大学英语三级

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