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    【题目】The spread of the Ebola virus in Nigeria is believed _______ by August, 2014.

    A．to be controlled

    B．to have been controlled

    C．to control

    D．to have controlled

    【答案】B

    【解析】本题考查非谓语动词。首先病毒的传播和控制应该是被动，C、D 选项是主动， 可排除；to have done 表示已经完成，而to do 表示将来，本题应该是 be believed to have done 表示完成，因为是2014年8 月。

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