Question

【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

Answer 1

【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。