11thOG SC中的两道题请教

正在按照大家指点的方法整理所有OG上的SC.有几个问题请教：

45. According to some analysts, the gains in the stock market reflect growing confidence that the economy will avoid the recession that many had feared earlier in the year and instead come in for a "soft landing," followed by a gradual increase in business activitiy.

这里为什么要用过去完成时，全文用的都是现在时态阿？

65. The only way for growers to salvage frozen citrus is to have it quickly processed into juce concentrate before warmer weather returns and rots the fruit.

 如果水果做主语的话，rot这个词到底是主动还是被动。错误答案和正确答案中的这一点上用法不同，而OG答案中并没有特别指出这一点作为罪证。

另，哪里有整理好的OG SC的所有正确句子，因为想看看EST喜欢的语言风格和句式关系。

盼复，谢谢