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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：
请问老师B选项错误的地方 是causes和emerged逻辑上解释不通吗 那么A选项的has emerged of是idiom吗 谢谢
解答：
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