请教as when的用法

berylgirl

as 当副词,没有实际意义时.可以与when 连用

leeon

那么as when与when/as有什么区别呢？

paopao

19/DQ83.       Although it claims to delve into political issues, television can be superficial such as when each of the three major networks broadcast exactly the same statement from a political candidate.

(A) superficial such as when each of the three major networks主谓不一致/such as用法错such没有指代（通常是个名词）。such as的用法: such as+noun/ doing/ what从句 /介词短语

such as+when从句:错。主谓一致错：each of sth+单数; 复数名词 each +复数。

(B) superficial, as can sometimes occur if all of the three major networks表达笨拙

(C) superficial if the three major networks all没有如果的意思，而是当。。。时if句意不对。变成了，只有if成立，结论才成立。

(D) superficial whenever each of the three major networks主谓不一致/无论何时，意思表达错（E）

(E) superficial, as when the three major networks each as when as和when分开理解比较好，as 作连词, when引导一个壮语从句，意思可以合起来理解：好像。

Gemj: 首先，有as when的组合，我在逻辑里揪出了两个例子（兴奋不已啊！）。
21. The initial causes of serious accidents at nuclear power plants have not so far been flaws in the advanced-technology portion of the plants. Rather, the initial causes have been attributed to human error, as when a worker at the Browns Mills reactor in the United States dropped a candle and started a fire, or to flaws in the plumbing, exemplified in a recent incident in Japan. Such everyday events cannot be thought unlikely to occur over the long run.
19. The charge made above against alternative medicine is most seriously weakened if it is true that
(A) predictions based on orthodox medicine have sometimes failed, as when a patient has recovered despite the judgment of doctors that an illness is fatal
(B) alternative medicine relies on concepts of the body and of the nature of healing that differ from those on which orthodox medicine is based
(C) alternative medicine provides hope to those for whom orthodox medicine offers no cure
(D) a patient’s belief in the medical treatment the patient is receiving can release the body’s own chemical painkillers, diminish allergic reactions, and promote healing
(E) many treatments used for a time by orthodox medicine have later been found to be totally ineffective
其次，as肯定是连词，意思是“正如”，when作副词。加在一起，结合这三个例子，“as when”的意思可以理解为“正如当…的时候。”

leeon

谢谢paopao，真是佩服gemj大侠！