题目内容
19.The natives in America are believed by some scholars across the worldto have immigrated(immigrate) from Eastern Asia tens of thousands of years ago.分析 世界上的许多学者相信,美国的土著人是好几万年前从西亚移民过来的.
解答 答案to have immigrated.考查不定式的完成时.sb+be believed+to do 为固定结构.根据句意,immigrate移民这个动作发生在好几万年前,发生在谓语动作are believed之前,用be believed to have done表示不定式动词发生在谓语动词之前.故填to have immigrated.
be said/reported/believed 后面固定用不定式,如果不强调时间或指在谓语动词以后发生的用不定式的一般时,即:to do.
如果不定式动词发生在谓语动词之前就用不定式的完成时:to have done.
如果不定式动词与谓语动词同时发生就用不定式的进行时:to be doing.
有时为了表示动作一直在进行,还可以用完成进行时:to have been doing.
点评 考查不定式的题,要留意不定式动作与谓语动作之间的先后顺序.
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