the experts were now fully convinced that the animal ___a puma1 must be 2 should have been 3 can only be 4 could only have been请问选择哪一个,及分别说出每个为什么对与错课文里面有一句话The experts were fully convinced that the animal was a puma(这是课文原文)
问题描述：
the experts were now fully convinced that the animal ___a puma
1 must be 2 should have been 3 can only be 4 could only have been
请问选择哪一个,及分别说出每个为什么对与错
课文里面有一句话
The experts were fully convinced that the animal was a puma(这是课文原文)
答
【答案】 must be 一定是
【解析】课文中原句的意思是：专家非常确定那个动物是美洲狮。
must be 表示非常肯定的猜测
should have been 表示原本应该是，而实际上不是
can only be 只可能是
could only have been 表示过去可能做过某事
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答
是NCE 的课文吧...应该是第一个啊，意思是不确定是不是一定就是PUMA，第二个意思是应该做却没做的，第三个是只能是，第四个和第三个是一个意思
例句：where is she ? she must be at hospital, i saw her cut herself with the knive
答
1 答案有问题.对过去事情的猜测,在表达“过去”事情时,如果强调“肯定是,一定是”的时候,应该用“must have been - - - - ”.
2 再说,句子裏面有了convinced,从句部分就不应该再用“must -- - - ”这样的结构.
3 这套练习题出得不好.