【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】本題考查非謂語動詞。首先病毒的傳播和控制應該是被動，C、D 選項是主動， 可排除；to have done 表示已經(jīng)完成，而to do 表示將來，本題應該是 be believed to have done 表示完成，因為是2014年8 月。

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