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    Other genetic similarities suggested they all ________ a single, common ancestor about 300 years ago.

    A．had B．have had C．have D．had had

     

    A

    【解析】A　考查动词时态。suggest在该句中意为“表明，暗示”，而非“建议”，所以宾语从句中不用虚拟语气。因为宾语从句的时间状语为about 300 years ago，故该句用一般过去时态，选A项。

     

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