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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：
选项A怎么理解has emerged of the patterns...这个结构：这里of后面的东西感觉都是修饰picture的。感觉B在意思上跟通顺一些，所以错选了B，当然也没有发现出B的主谓不一致。
解答：
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