【題目】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】本題考查非謂語(yǔ)動(dòng)詞。首先病毒的傳播和控制應(yīng)該是被動(dòng)，C、D 選項(xiàng)是主動(dòng)， 可排除；to have done 表示已經(jīng)完成，而to do 表示將來(lái)，本題應(yīng)該是 be believed to have done 表示完成，因?yàn)槭?014年8 月。

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