2. 外语
  3. The National Transportation Safety Board has recommended the use of fail-safe mechanisms on airliner cargo door latches assuring

The National Transportation Safety Board has recommended the use of fail-safe mechanisms on airliner cargo door latches assuring

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问题 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.
选项 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
答案E
解析 根据用法，排除A、B、C。D、E比较，由于assure之后不跟动名词，而跟that从句，排除D。
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