S：I'd like to return this book.
L：When did you（）it（）？
S：A couple of weeks ago.
L：Alright.Just sign here and leave the book with me.
A.check...out
B.borrow…in
C.sign… in
正確答案：check...out
題目：S：I'd like to return this book.
關鍵字：智慧樹
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