UC知道新概念3第一课书后几道习题不懂？求帮助
来源：百度知道 编辑：UC知道 时间：2024/06/25 11:03:32
1.Pumas never attack a human being except （ D ）cornered
A they are B being C that they are D when they are
为什么不能选B？
2.The experts were now fully convinced that the animal(D )a puma
A must be B should have been C can only be D could only have been
为什么不能选A？
3.A private collector is a man who collects ( A ）。
A for his own benefit B on his own C in private D unknown to the public
为什么不选D？
A they are B being C that they are D when they are
为什么不能选B？
2.The experts were now fully convinced that the animal(D )a puma
A must be B should have been C can only be D could only have been
为什么不能选A？
3.A private collector is a man who collects ( A ）。
A for his own benefit B on his own C in private D unknown to the public
为什么不选D？
except 有两种常用法：except for +名词，代词或V-ing，还有except + 从句 这句话是一种一般情况下的真理，而不是正在进行的动作。
fully convinced 已经表明十分确信了，A只是程度浅一些，只有D更符合那种肯定的语气。再加上因为主句为过去时态，则从句中的判断和推测要用could have done
要注意：这种题目属于选择最佳答案！
unknown形容词不能作为collect的宾语，如果为the unknown还勉强 起码无语法错误。
1.acd都差不多，b明显不同，出题不可能让你这么容易
2.
第一题 except 有两种常用法：except for +名词，代词或V-ing，还有except + 从句 故不选B，要我选就是D
第二题因为主句为过去时态，则从句中的判断和推测要用could have done
第三题unknown形容词不能作为collect的宾语，如果为the unknown还勉强 起码无语法错误