________ twice, the postman refused to deliver our letters unless we chained our dog.

A. Being bitten      B. Bitten

C. Having bitten     D. To be bitten      

B。


解析:

根據(jù)句意，句子主語(yǔ)the postman與動(dòng)詞bite之間為被動(dòng)關(guān)系，所以首先可排除選項(xiàng)C；再根據(jù)句意（尤其是注意關(guān)鍵詞twice）可知，表示正在進(jìn)行選項(xiàng)A和表示將要發(fā)生的選項(xiàng)D均不合題意。全句意為：郵遞員被狗咬了兩次之后要我們把狗拴起來(lái)，不然就不給我們送信了。

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