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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：
B选项哪里错了？老师上课说是因为单数后面用have错了，但是后面的主语难道不是causes吗
解答：
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