5、---Did you mend your bike this afternoon?

---Yes，I spent at least three hours_________ it．

A．finish doing    B．to finish doing    C finish to do    D．finishing doing

5、D

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---Did you mend your bike this afternoon?

---Yes，I spent at least three hours_________ it．

A．finish doing    B．to finish doing    C finish to do    D．finishing doing

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