题目内容
2.Global Health officials have been closely monitoring a new virus related to SARS that is believed ______ at least one person in Saudi Arabia.( )A. | to kill | B. | to be killing | C. | to have killed | D. | kill |
分析 世界健康官员一直都在密切监视一种新型的与SARS有关的病毒,这种病毒据说已经杀死了至少一个人.
解答 答案C.
分析句子结构可知,"that is believed ______ at least one person in Saudi Arabia"为定语从句,先行词为"a new virus related to SARS",关系代词"that"在从句中作主语;定语从句中运用了结构"sth/sb be believed to do sth",意为"某物/人据相信做了…";根据语境可知"这种病毒据说已经杀死了至少一个人"即"病毒杀死人"先于"密切监视"发生,因此用不定式完成式"to have done",表示"不定式动作在主句谓语动词之前完成",即"sth/sb be believed to have done sth",因此C项符合语境,故选C.
点评 本题考查非谓语动词的用法.把握好以下的知识:to do 表目的、将来;doing 表主动、伴随;done表被动、完成.同时答题步骤为:1.判断是否为非谓语动词,看是否有连词.2.找逻辑主语.3.判断逻辑主语 与非谓语动词的关系.4.看是否非谓语动词动作发生在主句谓语动作之前,如果是之前,就用完成式的形式.

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