The national Transportation Safety Board has recommended the use of fail-safe mechanisms on airliner cargo door latches [U]to assure that the doors are properly closed[/U] before takeoff and to prevent them from popping open in flight.
画线部分是正确的答案。但是答案D是to assure closing the doors properly.为什么就不对呢？我看他的解释也没哟看懂～
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85. Out of American's fascination with all things antique has grown a market for bygone styles of furniture and fixtures that is bringing back the chaise lounge, the overstuffed sofa, and the claw-footed bathtub.
[em26]OG96：
assure这个词是使相信（cause sb to be sure)的意思，一般用assure (sb) that或assure sb of sth/doing sth,选项to assure closing the doors properly不符合assure的用法，如果改成ensure倒可以考虑，所以应用to assure that the doors are properly closed .
[em26]OG85：
倒装句，主语是a market,所以谓语应用has.正常语序应为 A market has grown out of American's fascination with all things antique .
