17、 ______ 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

17、
______ 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-大学英语3

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