打出了正确的句子，红色标的是不理解的地方！谢谢大佬们
731. To develop more accurate populationforecasts, demographers would have to know（为什么用虚拟语气？） a greatdeal more than they do now about the social and economic determinants.
还有关于比较的问题，弄不清。。。 758. Price at the producer level are only 1.3 percent higher now than those of a year ago. 772. Heating-oil prices are expected to behigher this year than last（为何不是同758，thoseof last year??） because refiners are paying about 5 dollars more forcrude oil than they were last year.
777也是同一种题，没打出来。和772类似，than后面都没有用those of ..的形式 我晕了……到底怎么看than前后的结构呀！！！
求答疑，谢谢！
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发表于 2017-11-5 15:39:39
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