prep语法题，很诡异的一个

捷马小双

同志们，prep的一道语法题，就是不明白，是这个：Experts estimate that ten times as much petroleum exists in sources like tar stands ; heavy oil ,and perhaps even in shale than in conventional reservoirs.

 C, sources as tar stands ; heavy oil ,and perhaps even in shale as are

 D,sources as tar stands ; heavy oil ,and perhaps even shale as
求解答。。。。

捷马小双

D开头少个such。。。。

helio5

比较前面没有出现系动词
所以后面也不能出现系动词are
in shale加了个介词造成不平行，tar stands, heavy oil, and shale是平行项
（背景知识：油页岩里面也存有大量石油，只是很难提炼）

如果非要补出动词的话也应该用does
as much petroleum exists in such sources as tar stands, heavy oil ,and perhaps even shale as petroleum does in conventional reservoirs.

UlysessHope

看第一遍懵了，后来查了下，楼主把‘,’错打成‘ ; ’了
Experts estimate that ten times as much petroleum exists in sources like tar sands, heavy oil, and perhaps even in shale than in conventional reservoirs.
A. sources like tar sands, heavy oil, and perhaps even in shale than
B. sources like tar sands, heavy oil, and perhaps even in shale than are
C. such sources as tar sands, heavy oil, and perhaps even in shale as are
D. such sources as tar sands, heavy oil, and perhaps even shale as
E. such sources as tar sands, heavy oil, and perhaps even shale than

tar sands, heavy oil, shale 是并列的
选项C把 sources 和 shale 并列了，即使这点算对，" tar sands, heavy oil  "之间没有and连结也不对啊~