Since 1990 the global economy has grown more than it did during the 10,000 years from the beginning of agriculture to 1950.
Since 1990 the global economy has grown more than it did during the 10,000 years from the beginning of agriculture
Since 1990 the growth of the global economy has been more than that during 10,000 years, from when agriculture began
The growth of the global economy since 1990 exceeds that which had been for 10,000 years from the beginning of agriculture
The growth of the global economy since 1990 exceeds what it has been for 10,000 years, from when agriculture began
The growth of the global economy since 1990 exceeds what it did for the 10,000 years from the beginning of agriculture
A,主语是全球经济,Since 1990作状语修饰grown,后面的it指代全球经济ok。如果since 1990作定语修饰全球经济,则it存在同物指代的问题。
B,since 1990作状语修饰 the growth has been more,语意是:自从1990年以来,经济增长比农业开始以来的1000年的经济增长还要多。不是自1990年来就一直多,而是自1990年来的经济增长比之前1000年的增长总和还要多。
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