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题库 / GMATLA-SC-97
After increasing steadily for centuries, the total annual catch of all wild fish peaked in 1989; since that time, the total catch for most species has declined or plateaued, prompting conservation efforts designed to help prevent population crashes and possible extinctions.
fish peaked in 1989; since that time, the total catch for most species has declined or plateaued, prompting
fish peaked in 1989, but with the total catch since then declining or plateauing in the case of most species, prompting
fish had peaked in 1989; since that time, the decline or plateau of the total catch for most species, which prompted
fish, which peaked in 1989, and, in the case of most species, it has declined or plateaued since, prompted
fish, which peaked in 1989 but has since declined or plateaued for most species, and this prompted
题目分析：
本题虽然看起来有些难度，但是只要能把句子主干看清，答案十分容易选出。
选项分析：
选项A：Correct. 本选项在语法和逻辑上均是正确的。
选项B：but是并列连词，其应该连接两个完整的句子（有些时候会出现省略的现象，参考功能平行），本选项中，but身后没有谓语动词，不是完整的句子。
选项C：分号应该连接两个完整的句子，分号后没有谓语动词。
选项D：and是并列连词，其应该连接两个完整的句子；and身后，declined和prompted均为动词，之间缺少连词。
选项E：but是并列连词，其身前缺少谓语动词。另外，根据图形背景原则，and this prompted conservation efforts需改为prompting conservation efforts。这是因为，“激发一些关于保护鱼类的努力”是“整个捕鱼量下降”的原因，即，激发这一事件的发生时间是长于捕鱼量下降这一事件的，因此，“激发”事件应该做“捕鱼量下降”的背景，即，从句。