[問題]Prep-T2-Q39

[larry.tw]

39. (26492-!-item-!-188;#058&003168)

As it is with traditional pharmacies, on-line 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, on-line drugstores rely on prescriptions to be successful
(B) As with the case of traditional pharmacies, on-line drugstores rely on prescriptions to have success
(C) As is the case with traditional pharmacies, prescriptions are the cornerstone of a successful on-line drugstore
(D) As traditional pharmacies, so on-line drugstores rely on prescriptions to be successful
(E) Like traditional pharmacies, the cornerstone of a successful on-line drugstore is prescriptions

Ans: C

我想要請問的是未劃線的部份
since it is primarily prescriptions
it is不是應該接單數嗎?怎麼可以用複數prescriptions ??

請各位大大解釋一下~~

[ky]

這裡的it是虛主詞
適用場合為後接to v　及　that 子句

大全987- Q922有討論

[larry.tw]

疑??怎麼會勒....
it虛主詞...+that子句
子句要完整句阿,這邊沒有主詞阿,直接就attract the customers 很怪

[howardwang186]

這裡since it is ... that 為強調句型，是慣用的文法，可以強調主詞、受詞、副詞等等