OG语法题，请大牛们讲讲，主要是最后两个怎么弄。谢谢
96. The National Transportation Safety Board has recommended the use of fail-safe mechanisms on airliner cargo door latches assuring the doors are properly closed before takeoff and to prevent them from popping open in flight.
(A) assuring the doors are properly closed
(B) for the assurance of proper closing
(C) assuring proper closure
(D) to assure closing the doors properly
(E) to assure that the doors are properly closed
The correct choice will include to assure, an infinitive parallel to to prevent. Thus, A, B, and C are disqualified. Moreover, the participial phrases in A and C (assuring... ), easily construed as adjectives modifying latches, are confusing. Choices B and C are additionally faulty because, in omitting the noun doors, they fail both to specify what is being closed and to supply an antecedent for the pronoun them. D offers the necessary infinitive, but the gerund phrase closing ... imprecisely refers to the act of closing the doors rather than to the condition of the closed doors. Choice E, with its idiomatic and precise noun clause, is the best answer.
解释都讲得那么具体了呀！
Gerund Phrase表进行、持续性动作不能用来表状态。
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