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    【题目】The new suspension bridge __________ by the end of last month.

    A. has been designed B. had been designed

    C. was designed D. would be designed

    【答案】B

    【解析】句意：新的浮桥在上个月底之前已经设计好了。表示过去的过去，应用过去完成时，故选B。

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