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The experts were fully convinced that the animal ________a p

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The experts were fully convinced that the animal ________a puma.
A:must be B:should have been C:can only be D:could only have been
我自己感觉应该是选择A
课文里面有一句话
The experts were fully convinced that the animal was a puma.
所以,我认为,D选项用完成时表示“本可以”或 “本可能”都不对
请知道答案的同学们帮忙下。
The experts were fully convinced that the animal ________a p
was
专家完全相信这个动物是美洲狮
【俊狼猎英】 欢迎追问
A选项要改成must have bee.对过去推测用must have done
【俊狼猎英】 欢迎追问
再问: 选择题,不是课文的原文,请再看下。
再答: A选项要改成must have bee. 对过去推测用must have done 【俊狼猎英】 团队为您解答,欢迎追问
再问: 请解释下,这里could only have been 的用法好吗
再答: could have been, 也用来对过去推测,可能是, 加only只可能是。