[求助]GWD17-32指代问题

sprins

Navigators have known for thousands of years that the ocean has variable currents, but it is only in the last half century that a reasonably clear picture has emerged of the patterns and causes of ocean currents.

 

1. a reasonably clear picture has emerged of the patterns and causes of ocean currents
           
2. a reasonably clear picture of the patterns of ocean currents and their causes have emerged
           
3. a reasonably clear picture emerged of ocean currents, their patterns and the causes of them
           
4. there have emerged a reasonably clear picture of the patterns of ocean currents and what caused them
           
5. there had emerged a reasonably clear picture of the patterns of ocean currents and their causes

答案A  偶想问问各位nn   B除了主谓不一致的错误外 their的指代有问题么

skyzhang

我觉得似乎有点疑问就是，到底是指示patterns 还是 currents

sprins

对呀

如果是 N(1)'sN(2).......it 那么it只能指N（2）

如果是 N（1） of N(2)......it 可以指代N（1）或N（2）

但不知道 N(1)'sN(2).......its 和 N（1） of N(2)......its的情况要怎么算？

whsally

感觉their指代没有问题 只是causes 不能emerge

sprins

thank you~~

那时说N(1)'sN(2).......its 中 its只可以指代N（1）

和 N（1） of N(2)......its中its只可以指代N（2）么

sprins