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[Sentence Correction]
试题详情
题目：
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.
选项:
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:
A
提问：
那A选项中causes of ocean currents是什么成分呢？cause作为动词不是直接加名词就行？如果这部分是整个名词那前面连的主语是but后面的it吗？那为什么又有and呢？如果跟在emerge后面不是更奇怪？
解答：
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