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
技能get: 主谓一致；语序调整
A选项正常的语序是a reasonably clear picture (of the patterns and causes of ocean currents) has emerged.
戎毅仁_5l
谢谢！
听友123097119
看懂句意了但是为啥e错呢
Tirole_8m 回复 @听友123097119：
had emerged 过去完成式时态有误，再就是优先避开代词的选项
听友89033500
谢谢贾老师！