______ 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：石家庄铁道大学大学英语1

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