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GWD 17-32

Q32:


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




   Answer: A  

of the patterns and causes of ocean currents为什么放在emerge后面呀?
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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.





  B.(a reasonably clear picture of  the patterns of ocean currents) and (their causes) have emerged
用have改变原文的意思,变成了picture和causes的并列。即便改成has,their的指代仍然错。A表达清晰不含歧义。

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如果B中的have为has那还是A比B好吗?

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避免头重脚轻

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