og 21

21.   Defense attorneys have occasionally argued that their clients’ misconduct stemmed from a reaction to something ingested, but in attributing criminal or delinquent behavior to some food allergy, the perpetrators are in effect told that they are not responsible for their actions.

(A) in attributing criminal or delinquent behavior to some food allergy

(B) if criminal or delinquent behavior is attributed to an allergy to some food

(C) in attributing behavior that is criminal or delinquent to an allergy to some food

(D) if some food allergy is attributed as the cause of criminal or delinquent behavior（B）

(E) in attributing a food allergy as the cause of criminal or delinquent behavior

In choices A, C, and E, in attributing... behavior modifies the perpetrators, producing the illogical statement that the perpetrators rather than the defense attorneys are attributing behavior to food allergies. Choice C is also wordy, and attributing... as is unidiomatic in E. In the correct form of the expression, one attributes x, an effect, to y, a cause; or, if a passive construction is used, x is attributed to y. D avoids the initial modification error by using a passive construction (in which the attributors are not identified), but attributed x as the cause of y is unidiomatic. Choice B is best.

if条件句是不可以随便加入,或是删除,-----新东方老师说的

怎么判断它什么时候可以加入or删除呢?

拜赐

当逻辑上其他选项有致命错误时，考虑一下if的可能。

这道题，in attributing的修饰对象有逻辑问题，所以排除A/C/E，只剩下B/D两个if引导的句子，所以，别无选择。