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题目内容
（石家庄铁道大学大学英语1）
______ 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
A、 Being bitten
B、 Had been bitten
C、 Having bitten
D、 Having been bitten
参考答案