prep一道题，搜了帖子没得到明确答案，怒求重新讨论~

sunyuwei

如下是一道prep的题目，后面是破解版的答案，麻烦大家看看答案旁边的蓝字部分是我的问题~怒求大家解答下~

As it is with traditional pharmacies, online drugstores rely on prescriptions to be successful, since it is primarily prescriptions that attract the customers, who then also buy other health-related items.

A. As it is with traditional pharmacies, online drugstores rely on prescriptions to be successful

B. As with the case of traditional pharmacies, online drugstores rely on prescriptions to have success

C. As is the case with traditional pharmacies, prescriptions are the cornerstone of a successful online drugstore

D. As traditional pharmacies, so online drugstores rely on prescriptions to be successful

E. Like traditional pharmacies, the cornerstone of a successful online drugstore is prescriptions

A: it无指代，试图指代后面这个句子错；后面it没有前面对应的单词（后面是强调句，it 可以无指代的吧？）

B: as with the case 错（这样的as开头的句子有哪些是正确的哪些是错误的？）；后面it没有前面对应的单词（后面是强调句，it 可以无指代的吧？）

C: correct

D: as A do, so B do结构

E: like pharmacies, pharmacies和cornerstone不对等

注意：

1、as is the case with … 是prep新出现的固定搭配

2、未划线部分出现单数it, 应该找划线部分与之对应的单数名词

sunyuwei

顶。。。。

sunyuwei

哇咔咔。，。。。。。。

sunyuwei

lalala......