[問題]大全889

[Jen-Cheng]

889.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

Ans:A

我的問題是，答案A中，用present perfect tense，會不會有歧義?

我的思路如下:

OG88.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."
(A)so unrealistic as to constitute
(B)so unrealistic they constituted
(C)so unrealistic that they have constituted
(D)unrealistic enough so that they constitute
(E)unrealistic enough so as to constitute

OG釋義:The verbs are and calls indicate that the sculpture is being viewed and judged in the present. Thus, 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 face but no longer do so.

照它的釋義，現在完成式，開始於過去，結束於現在(不持續到未來..but no longer do so)，照這個觀念，用到大全889的A上:

"a tornado is so small that such a study has not been practical"
這題正確答案卻是用了現在完成式，表示such a study從過去到現在都是not been practical，根據"but no longer do so"，表示未來會變成 been practical，但是前面卻用了表現事實的現在式" a tornado is so small"，表示將會持續一直都是 impractical，這樣不是前後兩句搭不上來嗎?如同OG88不選C的原因，也是因為它用了現在完成式，造成歧義。

我的想法那裡錯了??