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白勇语法p161 32条 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 for popping open in flight. a assuring the doors are properly closed b for the assurance of proper closing c assuring proper closure d to assuring closing the doors properly e to assure that doors are properly closed 答案选是e 白勇语法上面说,d是强调动作,不是xdf说,主动优先么,而且d选项比e选项更简洁,e使用了从句,而d使用的是短语 |
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