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[Issue Essay]
试题详情
题目：
Analytical!
选项:
答案:
提问：
For some birds the sense of smell appears to paly a role in navigation, since pigeons with surgically removed olfactory nerves ( were found to have increased difficulties ) in homing.
A. were found to have increased difficulties
B. have been found to have increased difficulty
C. were found to have increasing difficulty
D. had been found to have increased difficulties
E. have been found to have increasing difficulties
答案是B，我选的A。不明白为什么要用现在完成时，而且感觉困难应该是复数。麻烦老师讲解。
解答：
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提问：
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提问：
想问一下这道题怎么理解？
解答：
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提问：
关于平行比较，前三句是一个问题，我不太明白这个比较后面的did/is的位置，为何有的放在代词前有的在代词后？比如前两句，did可否放在those are后面？
最后那句话是否平行呢，that of course可都指代social structure，谢谢
此外，还有句i have more apples than eric‘s apples这句宾语比较是否正确呢？
解答：
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提问：
语法！老师，我想问一下，这几个的区别
Taste buds are xxx，each of them has x. 是错的，each of them has x 这里是一个单独的句子
Taste buds are xxx，each of which has xxx.对了，each这个句子是定语从句吗？还是同位语从句？
Taste buds are xxx，each has…跟each of them has ……是一样的吗
Taste buds are xxx，each having…是同位语修饰吗
解答：
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解答：
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