She spent the next 10 years taking in washing，（）to pay back the money they had borrowed from the bank.
A.slaving away
B.slave away
C.to slave away
D.slaved away
正確答案：slaving away
題目：She spent the next 10 years taking in washing，（）to pay back the money they had borrowed from the bank.
關鍵字：智慧樹
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