The Doha Round of WTO talks in Geneva last month collapsed as efforts to reach a compromise on the point at which developing countries could raise import tariffs on farm products failed.
主句:The Doha Round of WTO talks collapsed 简单句:主+谓
last month 时间状语
as efforts to reach a compromise on the point at which developing countries could raise import tariffs on farm products failed. as引导的原因状语从句
efforts 从句主语
to reach a compromise on the point 不定式短语作定语修饰主语efforts
at which developing countries could raise import tariffs on farm products 定语从句修饰point
(at which相当于at the point,在定语从句中作状语;developing countries主语,could raise谓语, import tariffs on farm products宾语)
failed 原因状语从句的谓语
at不能去除,因为从句主谓宾成分齐备,引导词只能做状语,at which 可以作状语,which疑问代词不能做状语.
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