AIDS is said to have been the biggest

问题描述:

AIDS is said to have been the biggest
ALDS is said to have been the biggest health challenge to both men and women in that area over the past few years.为什么用to have been?
1个回答 分类:英语 2014-10-03

问题解答:

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过去几年来,艾滋病一直被认为是那个地区对男人和女人最大的健康挑战.is said to be是个短语.被认为、被称作是.have been 是完成时,因为后面用了“over”
 
 
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