Unlike a hurricane, which can be observed from within, a tornado is so small that such a study has not been practical. (A) that such a study has not been practical (B) that studying it that way has not been impractical (C) for such studies as this to have been impractical (D) as to not make such a study practical (E) as to be impractical of study AnswerA) 我選(D) 有沒有 so ... as not to (如此..以至於 不能 ....) 或是 so as not to (表目的的 不能) 這種用法
present perfect tense发生于过去,结束于现在,那such a study 未来是 practicial or impracticial?
According to OG10-88,有一段解释如下:neither the past tense verb constituted (in B) nor the present perfect verb have constituted (in C) is correct; both suggest that the statue's features once constituted an artificial facebut no longer do so
照它的解释,这一题such a study在未来应该是practical(因为 no longer do so),可是这一题前面”a tornado is so small”,这是一个事实的描述,表示未来也不会变,就不就应该是such a study 在未来也应该是 impracticial..
OG 88:The Emperor Augustus, it appears, commissioned an idealized sculpture portrait, the features of which are so unrealistic as to constitute what one scholar calls an "artificial face."
逻辑主语对的时候,so as to 比so that简洁,但是从这道题目看,明显tornado to be study,逻辑主语是不对的。所以不能选so as to。