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

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Thelibrarianatthedeskpromisedtogetthebookforme_____itwasreturned.