英语长句分析,较难,
However,it is common to hear assertions of the kind " if you were left on a desert island a few seed potatoes would be more useful to you than a million pounds" as though this proved somthing important about money except the undeniable fact that it would not be of much use to anyone in a situation where very few of us are at all likely to find ourselves.
if引导的是虚拟从句,但是为什么proved也用过去式.
第二个it在句中做什么成分?