题目信息
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
参考答案及共享解析
共享解析来源为网络权威资源、GMAT高分考生等； 如有疑问，欢迎在评论区提问与讨论
本题耗时：
已选答案：
正确答案：
A:a reasonably clear picture has emerged of the patterns and causes of ocean currents
考点：逻辑
选择逻辑意思最好的
A选项。一张图上出现水流的图纹和形成水流的原因。
B选项。水纹图和它们的原因出现了。their指代不明，而且逻辑意思改变。
C选项。一张图上出现水流、它们的图纹和他们的原因。their/them指代不清，逻辑意思也改变了。
D/E太罗嗦了
加入收藏
在线答疑
题目来源
GWD
