两道语法题~

janelxf

1 A study of food resources in the North Pacific between 1989 and 1996 revealed that creatures of the seabed were suffering from dwindling food supplies, possibly resulting from increasing sea surface temperatures during the same period.
B that creatures of the seabed were suffering because food supplies were dwindling, possibly as a result of an increase in
答案是B，我不知道A错在了哪里~
2 Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil, their descendents, popular known as killer bees, had migrated as far north as Southern Texas.
答案是A，请问画线部分是做状语吗？主句为啥用过去完成时呐？

queenie924

我记得做过一题··解释说suffer from接结果不接ving。

janelxf

但不是有suffer from doing sth这种用法吗？~

zywang12

我今早做第一题的时候再次做错了~~~~(>_<)~~~~   解释是说这是发生在89--96的一个事实，用increasing现在分词形式有一种表达一直进行的含义，所以要表示结果的话应该使用an increase或者increased