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标题: [求助]gwd-17-32 [打印本页]

作者: totolin116 时间: 2006-10-12 22:59
标题: [求助]gwd-17-32

32。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.

A. a reasonably clear picture has emerged of the patterns and causes of ocean currents

B. a reasonably clear picture of the patterns of ocean currents and their causes have emerged

C. a reasonably clear picture emerged of ocean currents, their patterns and the causes of them

D. there have emerged a reasonably clear picture of the patterns of ocean currents and what caused them

E. there had emerged a reasonably clear picture of the patterns of ocean currents and their causes

答案是a.1）不明白为什么a要用has emerged这个时态，想了很久实在无办法理解。

2）不知道c有什么错

劳烦各位赐教~~！！

作者: eddienumb 时间: 2006-10-13 01:06
c的错除了时态 their patterns and the causes of them 这是叫双重主格么？我不清清楚这种语法错误叫什么名字但肯定是错的
关于事态 in/during/within/over + last/past /recent + 一个时间应该用现在完成时

作者: nettrinity 时间: 2006-12-18 20:44
不懂，顶一下

作者: aeoluseros 时间: 2008-11-3 09:50

以下是引用eddienumb在2006-10-13 1:06:00的发言：
c的错除了时态 their patterns and the causes of them 这是叫双重主格么？我不清清楚这种语法错误叫什么名字但肯定是错的

um...求解...这个是什么错误呢？

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