[急！请教]GWD25-39

yangwit

Q39.

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.

 

我选了B。答案是A。

题目用了强调结构it is ... that ... 如果还原a reasonably clear picture of the patterns of ocean currents and their causes have merged only in the last half century. 所以选B。为什么是A？

求教了！还有两天就考试了，急

 

fionajiang

a reasonably clear picture of the patterns of ocean currents and their causes have merged only in the last half century

2个OF连用是比较忌讳的, 这里有2个复数,patterns和 currents,后面的their指代不清楚. 再说cause不能emerge, 他是本来就存在的只是没有被发现, 但是the big picture of the cause是可以emerge的 

yangwit

谢啦！

kf771012

這提的還原是: a picture of the patterns...current has emerges. 但是前面主詞太長 所以才把修飾主詞的搬到後面