______ twice, the postman refused to deliver our letters unless we chained our dog up. A、 Being bitten B、 Had been bitten C、 Having bitten D、 Having been bitten

______ twice, the postman refused to deliver our letters unless we chained our dog up.
A、 Being bitten
B、 Had been bitten
C、 Having bitten
D、 Having been bitten

出自：石家庄铁道大学-土木工程-大学英语III

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